Answer:
Explanation:
option A is correct
What is the last energy level of N? Mg?
Answer:
2
3
Explanation:
To infer the last energy of the given atoms, we need to write their electronic configuration:
For N = 1S² 2S² 2P³
Mg = 1S² 2S² 2P⁶ 3S²
The energy levels are usually designated as;
n = 1
n = 2
n = 3
n =4
For N, the last energy level is 2
Mg, the last energy level is 3
We can also determine this number by the periods the atoms can be found.
The most common physical state of the elements is
Answer: Solids, gases, or liquids
Explanation:
Matter can undergo physical and chemical changes called Phase Changes. Substances are classified based on physical states, often referred to as the States of Matter. At room temperature and pressure the common Physical States of elements are solids, gases or liquids.
Most are solids only 11 are gases and 2 are liquids
The most common physical state of elements in the periodic table is Solids as there are about 84 elements which exists as solids at room temperature and pressure in the periodic table
Elements in the periodic table can exist as one of the prominent physical states at room temperature and pressure.
These physical state may be;
SolidLiquidor GasElements which are solid at Room Temperature are about 84.At room temperature and pressure, only two elements are existent in liquid phase are: Bromine. Mercury.A look at the periodic table evidently tells that there are 11 elements in the table that exist in the gaseous state at room temperature and pressure.These elements are Hydrogen, Helium, Nitrogen, Oxygen, and the other Noble gases.
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list in the following elements in order of smallest to largest atomic radius. F, Cl, Br, l
And which has a larger atomic radius?
What is Aerosol,sol and gel
Which of the following elements are characterized by having full outermost s and p
orbitals?
F. Period 7
G.
Group 8A
H.
Inner transition elements
J.
Periods 4, 5, and 6
Answer:
Group 8A
Explanation:
Group 8A elements are characterized by having full outermost s and p orbitals. These elements are also known as the noble gases or inert gases. They occupy the last group on the periodic table.
They are known to have an outer shell configuration of ns² np⁶The configuration reveals that atoms of all the elements have completely filled orbitals in their outer shell sublevels. This accounts for the non-reactivity of elements in this group. Most of the elements in the group have high ionization energy and very low electron affinity values.Some of the elements in this group are Neon, Argon, Krypton, Xenon, and Radon.
Suppose you wanted to determine the probability of a student being found at
various locations in your school building at 10am . How might you investigate this
problem based on probability?
Answer:
[tex]the \: proberbility \: will \: be : \\ \frac{number \: of \: class \: rooms \: with \: her \: friends}{total \: number \: of \: class \: rooms \: in \: the \: building} [/tex]
Explanation:
[tex]♨Rage♨[/tex]
Identify the chemical formula of ammonia.
Answer:
The chemical formula for ammonia is NH3
Explanation:
Nitrogen trihydride
6. Now, revise your definition for waves to include energy and matter.
A wave is a phenomenon that...
Answer:
A wave is phenomenon that transfers energy from one point to another through a disturbance without affecting the matter.
Explanation:
A wave is phenomenon that transfers energy from one point to another through a disturbance without affecting the matter.
There are two main types of waves Longitudinal waves travels parallel to their source. For example, sound waves. Through a series of rarefactions and compressions, longitudinal waves are propagated. Transverse waves travel perpendicular to their source.help please this is due at 2!!
Answer:
I believe the answer is C (3)
Explanation:
In an atom usually electrons number and protons number is equal.
Here lithium atom has three protons
So it has three electrons، too.
How do minerals differ from ores?
Ores: metal/coal (iron, gold, coal)
Mineral: not metal, (Granite, limestone,
arrangement of small particles in substance is
Answer:
The particle model represents particles by small, solid spheres.It describes the arrangement, movement and energy of particles in a substance. The model can be used to explain the physical properties of solids, liquids and gases.
Answer:
The particle model represents particles by small, solid spheres. ... It describes the arrangement, movement and energy of particles in a substance. The model can be used to explain the physical properties of solids, liquids and gases.
Explanation:
how many joules are needed to heat 20.0 g of Au from 10 C to 50 C
Answer:
Its actually Q = 103.2 J
Explanation:
When thermal energy is removed from a system, what happens to the
temperature and the average kinetic energy of the system?
Temperature decreases, average kinetic energy increases
Temperature decreases, average kinetic energy decreases
Temperature increases, average kinetic energy increases
Temperature increases, average kinetic energy decreases
Answer:
When the average kinetic energy of the molecules goes up (a rise in temperature), the average speed of the molecules increases. And lower average kinetic energy of the molecules means they have lower speed. ... When heat (energy) goes into a substance one of two things can happen
Explanation:
hope this helpss!!!
How many moles contain 3.1 x 1022 molecules of H2O
Answer:
The answer is 0.051 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
N = 3.1 × 10²² molecules of H2O
We have
[tex]n = \frac{3.1 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.05149501...[/tex]
We have the final answer as
0.051 molesHope this helps you
What is the right answer?
Answer:
Option C
Explanation:
In Lewis dot structure the valence electrons are represented as dots around the symbol.
For example,
In hydrogen valence electron is only one it can be represented as,
H·
We know that in covalent bonding atoms share their electron to complete the octet. Thus, their Lewis dot structure would be represented as,
H:H
This is the Lewis dot structure of H₂.
In given atom X their are 2 valence electrons (3s²) thus its Lewis dot structure contain two dots around the symbol.
Option C is correct answer because it has only two dots which actually represent valence electrons.
Other options are incorrect because symbol X has more than two electrons/dots.
The diagram shows a stage in meiosis.
Which stage of meiosis is pictured?
metaphase I
anaphase I
metaphase II
anaphase II
Answer:
It's not A or D
Explanation:
I was looking all over for answers and I saw A and D, so I used A. It was wrong, so I retook it and used D. Wrong. Your answer is either B or C. I am sorry I couldn't help more.
Answer:
it is b same question was on my quiz
Explanation:
how many atoms can you fit on the head of a pin
Answer:
According to google, "About five million million hydrogen atoms could fit. Some factors would affect that number like the area of the head and the size of atoms (as well as attractions between atoms). Some atoms are larger than others." Is this accurate? I'm not sure. Good luck! :)
Gamma
ray
Which has the longest wavelength?
Ultra-
violet Infrared
Radio
Which has the highest frequency?
X-rays Visible
Microwave
WWW
Answer:
Radio waves
X-rays Visible
Explanation:
The wavelength of a wave is the difference between successive crests on a wave line. Waves with a very high wavelength have low energy.
Frequency is the number of waves that pass a point per unit of time. The higher the frequency, the higher a wave's energy.
From the given spectrum, wavelength increases from left to right. This puts radio waves as the wave with the longest wavelength. It is also right to say, it has the least energy. Also, frequency decrease from left to right. Gamma rays have the highest frequency in the spectrum. This is followed by x-rays.Answer:
Radio waves
X-rays Visible
Explanation:
Where exactly is an orbital? I understand they are a volume where we expect to find electrons 90% of the time but I don't understand where their shapes are and fit on an atom, and the different forms of orbitals confuse me a little. Can someone explain me where they are with the help of an image? Pardon me if my question isn't very clear
Answer:
95% of the time (or any other percentage you choose), the electron will be found within a fairly easily defined region of space quite close to the nucleus. Such a region of space is called an orbital. You can think of an orbital as being the region of space in which the electron lives
Which stage of the body's response to stress causes your body to try and restore
a state of balance, however sometimes causing pathological issues?
O Resistance Stage
"Fight or Flight"
"Alarm Stage"
O Recovery State
These models show the electron structures of two different nonmetal elements. Element 1 at left has a purple circle at center with 2 concentric black lines around it. The first line has 2 small green balls on it. The second line has 8 small green balls on it. Element 2 at right has a purple center with 5 concentric circles around it, with the first circle innermost. The first circle has 2 small green balls on it, and the second circle has 8 small green balls on it. The third circle has 18 small green balls on it, and the fourth circle has 18 small green balls on it. The fifth circle has 6 small green balls on it. Which element is likely more reactive, and why?
Answer:
Element 2
Explanation:
If we look at the model stated for element 1, it is clear that element 1 must be a noble gas. It has eight electrons in its outermost shell this implies that it has already attained a complete octet of electrons and is reluctant towards chemical reaction.
The second element belongs to group 16 since it has six electrons on its outermost shell. It is certainly more reactive than element 1 which is a noble gas.
Answer: D
Element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.
Explanation: Answer on Edgenuity
WILL MARK BRAINLIEST!!!! HELPPPP
what is the difference between simple distillation and fractional distillation
Answer:
A single distillation cycle is enough to separate the mixture. ... Simple distillation is the method used to separate substances in mixtures with significantly different boiling points, while fractional distillation is used for mixtures containing chemicals with boiling points close to each other.
Explanation:
Pedro is baking a cake for his experiment on chemical changes. He knows a chemical change will occur when he puts the cake mixture in the oven. He would like to know what will happen when the cake is removed from the oven. What prediction would you make for Pedro's experiment? A. The chemical changes occurred because the chemicals changed. B. The chemical changes occurred because there was a change in light energy. C. The fruit and the hamburgers were affected by an increase in heat energy. D.The fruit and the hamburgers were affected by a decrease in heat energy.
Answer:
A. The chemical changes occurred because the chemicals changed.
Explanation:
When baking a cake several chemical reactions occur that change the chemical composition of the ingredients used in baking. An ingredient like baking powder releases carbon dioxide when it undergoes a temperature change in the oven. A chemical change is supposed to change the form of a substance.
An endothermic reaction also occurs when the ingredients absorb heat energy to produce several changes. The firmness of the cake occurs because of the heat absorbed by the proteinous content of the egg.
What accounts for the attractions in a chemical bond?
Answer:
A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.
Explanation:
How many electron shells are in period 1
Answer:
1
Explanation:
The amount of electron shells is the number of the period
At 9°C a gas has a volume of 6.17 L. What is its volume when the gas is at standard temperature?
Answer:
V₂ = 5.97 L
Explanation:
Given data:
Initial temperature = 9°C (9+273 = 282 K)
Initial volume of gas = 6.17 L
Final volume of gas = ?
Final temperature = standard = 273 K
Solution:
Formula:
The Charles Law will be apply to solve the given problem.
According to this law, 'the volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure'
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 6.17 L × 273K / 282 k
V₂ = 1684.41 L.K / 282 K
V₂ = 5.97 L
Question 2 of 10
What are Van der Waals forces?
A. Forces that change polar molecules into nonpolar molecules
B. Very strong forces that exist between two different molecules
O c. Hydrogen bonds in nonpolar molecules caused by a permanent
dipole
D. Small dipole attractions between molecules caused by a
temporary electron shift
SEB
Answer:
D
Explanation:
Van der Waal forces are small dipole attractions between molecules caused by a temporary electron shift ,here, the option D is correct.
What are Van Der Waal forces?Van der Waals forces exist among all kinds of atoms and molecules. The origin of this force stems from the instantaneous dipole-induced dipole interactions among adjacent polar atoms and molecules.
Among polar molecules, there are three components that contribute to the total forces: the induction force, the orientation force and the dispersion force.
The Van Der Waal forces that act between macroscopic bodies and surfaces in a solvent medium are relevant to the phenomena of protein adsorption.
Van Der Waal forces are the small dipole attractions between molecules caused by a temporary electron shift , thus, option D is correct.
Learn more about Van Der Waal forces here:
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50 POINTS: PLEASE ANSWER AS QUICK AS POSSIBLE!
Question:
After getting their results in, a group of scientists went back and looked at their study. As planned, their experiment consisted of three groups. The first group received a new medicine at a normal dose, the second group received the medicine at half the dose, and the third group received the medicine at twice the dose.
Which of the following best describes what went wrong with the scientists’ study?
Choices:
- an improper experimental procedure
- the lack of a control group
- selection bias
- human error
Explanation:
The lack of a control group
Please he with c
Please I swear I am crying
Calculate the volume in milliliters of a 5.05-g sample of a solid with a density of 3.25 g/mL.
Answer:
The answer is 1.55 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question
mass = 5.05 g
density = 3.25 g/mL
We have
[tex]volume = \frac{5.05}{3.25} \\ = 1.5538461...[/tex]
We have the final answer as
1.55 mLHope this helps you