Answer:
Explanation:
Given isotope;
C - 12
Unknown:
Atomic number = ?
Atomic mass = ?
Solution:
Isotopes of an element have the same electronic configuration but only differ in their masses. They have the same atomic number but different mass numbers due to the differences in the number of neutrons in their various nuclei.
For carbon; atomic number = 6
Atomic mass of this isotope = 12
The atomic number is the number of protons
Atomic mass is the number of protons and neutrons
T/F: If the number of protons changes from 7 to 9, the element changes
4. Which of the following ideas is NOT true? *
A. Atoms of the same element have a constant number of neutrons.
B. Atoms have a central, positively charged nucleus.
C. Atoms may gain or lose electrons to become ions.
D. Atoms of the same element have a constant number of protons.
Answer:
c
Explanation:
Answer:
the answer of the question is C
what does the atomic mass number of each atom represent.
The atomic mass number tells us the number of neutrons and protons in the nucleus of an atom.
You can choose from four different materials to make the handrails that run up the stairs and around the playhouse: steel, aluminum, solid plastic, or pine wood.
2. Would you want to minimize or maximize the heat transfer to and from the handrails? Explain your reasoning.
Answer: The best material to make the handrails of the playhouse is Aluminum. This is because aluminum is an extremely versatile metal with a number of advantages, it is recognized for being both lightweight and flexible.
Explanation:
HOPE THIS HELPS!
ALSO THE OTHER ANSWER IS WRONG.
JUST SAYING >33
helpp!!
What pair of elements is most likely to form a metallic bond?
a.sodium and arsenic
b.lithium and oxygen
c.magnesium and zinc
d. calcium and selenium
who ever answers gets the branliest !
Answer:
c.magnesium and zinc
Explanation:
you're welcome
PLEASE! 46 POINTS!
1.-There are millions of unique substances in the universe because elements can combine in many different ways to form _____.
A.-mixtures
B.-solutions
C.-compounds
D.-ions
2.- Water is an example of a(n) _____.
A.-unique substance
B.-chemical compound
C.-covalent compound
D.-all of the above
3.- Which statement is true about water and hydrogen peroxide?
A.-Both substances have the same properties.
B.-Both substances have the same chemical formula.
C.-Both substances consist of hydrogen and oxygen
D.-Both substances are mixtures of elements.
4.-. Chemical bonds always involve _____.
A.-ions
B.-atoms
C.-metals
D.-electrons
5. The ratio of elements in a given compound _____.
A.-is always 2 to 1
B.-is always the same
C.-may vary
D.-two of the above
6. An oxygen atom has eight valence electrons.
True
False
7. A molecule of carbon monoxide has two carbon atoms and one oxygen atom. True
False
8.- The types of bonds in chemical compounds determine many of their properties.
True
False
9.- The same elements may form different compounds.
True
False
10.- The chemical formula for carbon dioxide is CO2.
True
False
Answer:
1. compounds
2. Covalent Compound
3. Not sure
4. ions
5. C
6. false
Answer:
1. compounds
2. Covalent Compound
3. Both substances have the same chemical formula
4. ions
5. C
6. false
Why and how are elements arranged in 4 period
Answer:
The reason for the arrangement of elements in the period is based upon the atomic number. In all periods, including the elements are arranged according to the atomic number in increasing order
Explanation:
Hope this helped!
Answer:
The reason for the arrangement of elements in the period is based upon the atomic number. In all periods, including the elements are arranged according to the atomic number in increasing order.
Explanation:
How would an invasive species affect an ecosystem?
Group of answer choices
The invasive species would integrate easily into the ecosystem.
The invasive species would take over in the area and throw off the balance of the ecosystem.
The invasive species would balance the ecosystem.
The invasive species would change the abiotic factors in the area.
Answer:
The invasive species would take over in the area and throw off the balance of the ecosystem.
Explanation:
Invasive species can harm both the natural resources in an ecosystem as well as threaten human use of these resources. An invasive species can be introduced to a new area via the ballast water of oceangoing ships, intentional and accidental releases of aquaculture species, aquarium specimens or bait, and other means.
Invasive species are capable of causing extinctions of native plants and animals, reducing biodiversity, competing with native organisms for limited resources, and altering habitats. This can result in huge economic impacts and fundamental disruptions of coastal and Great Lakes ecosystems.
Hope this helped!
What is Cd2+ and F1- together as a formula
Answer:
i am not sure tho
Explanation:
Cd ²+ + F¹- = CdF2
F fluor is a non metal so he takes the electons that Cd gives so if Vd has to give 2 electrons and F can take only 1, there has to be 2 F atoms so all the electrona can be neutral and in ionisation
Which atmospheric layer is closest to Earth's surface?
A exosphere
B. mesosphere
c. stratosphere
D. troposphere
Answer:
The answer is the troposphere
Explanation:
It is the closest to earth
Can someone help me click the picture
Answer:
A product
B coefficient
C script
D rectant
Can someone help mee pleaseeeee please!
Answer:
im sorry dude, just trying to complete my daily challenge
Explanation:
can someone help me please i’ll give brainly
[tex]\huge\boxed{Option A}[/tex]
_____________________________________As the option says, the kinetic energy will decrease. the volume decreases because the molecules are slower and collide less. Less molecules make the effective collisions due to which the kinetic energy of molecules is less, so less kinetic energy results in the shrinkage. So decrease in temperature lowers the rate of the reaction and in the volume.
_____________________________________Best Regards,'Borz'A dish is given to you, which contains a blackish yellow powder. When you move a magnet over it, black particles fly upwards and get stuck to the magnet. All that is left in the dish is a yellow powder, which you discover to be sulfur.
Was your original powder an element, compound, or mixture, and how do you know?
PLEASE ANSWER IF YOU HAVe an ANSWER OR NOt JUST FOR THE POINTS OR ELSE YOU WANT TO BE REPORTED!!!! please and thank you!
Answer:
It is a Mixture
Explanation:
It's a mixture because it was a substance made from mixing other substances together. And when the magnet went over the powder, the iron is lifted and not the sulfur. So the different parts of it can be separated by any physical means that allows the parts to seen separated
Answer:
its is a mixture
Explanation: because I did the question
How many moles are there in a 122 gram sample of nickel (Ni)?
7.16 x 103 moles
6.22 mol
2.08 mol
0.481 mol
The atomic mass of nickel is 58.71 gm and the given mass of nickel is 122 gm. Therefore, 2.08 moles are present in a 122-gram sample of nickel.
Nickel:
The atomic number of nickel is 28.The symbol of nickel is Ni.Density of a nickel 8.908 g/cm3.It is a d block element.It belongs to group 10 and period 4.It is also called transition metal.It is a metal and is located between groups 2 and 3.Mass of nickel given: 122 grams.
Atomic mass of nickel: 58.71 g mol
Number of moles = Mass / molar mass
= 122/ 58.71
= 2.078
= 2.08 moles.
The atomic mass of nickel is 58.71 gm and the given mass of nickel is 122 gm. Therefore, 2.08 moles are present in a 122-gram sample of nickel.
To learn more about nickel, refer to the link:
https://brainly.com/question/3542561
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What element has 4 energy levels and 8 valence electrons?
The element having 8 valence electrons and 4 energy levels is krypton, (Kr) it is a noble gas included in 18th group.
What is krypton?Krypton is 36th element in periodic table with main shell electronic configuration, K= 2, L= 8, M= 18 and N= 8 where, K, L, M and N are energy levels.
Krypton is in the group noble gases also called inert gases. The group members of Kr are, Helium, argon and xenon. Thus krypton is the element with 4 energy levels and 8 valence electrons.
To know more about Kr, refer the link below:
https://brainly.com/question/14535867
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During the apollo missions,an astronaut took a golf ball to the moon. He placed it on the moon’s surface and hit the ball with a golf club. Which property of the golf ball was different on the moon than on earth?
A.) density
B.) mass
C.) volume
D.) weight
Answer:
b.)
Explanation:
Because you would have a different weight on the moon because of it's low gravity
periodic table of elements
Vertical Column is a group
Horizontal is Period
Aliki earth metals is a group
Lithium- Neon is both
Based on electrons are both
Number of electron shells is both
1. What part of the human body has the same role as the processor on a computer?
2. What part of the human body has the same job as the wires and circuits in a computer?
Answer:
Mother board, it is essentially the brain
Explanation:
What is the force needed to cause a 80kg object to accelerate at 1.6m/s??
Answer:
The answer is 128 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 80 × 1.6
We have the final answer as
128 NHope this helps you
balance equation for complete combustion of butane
what is the physical state of caesium at 35°c? Explain why
Is lysomes a plant or animals cell
Answer:
Animal
Explanation:
A car is traveling at 50mph. How long will it take the car to travel 300 miles?
Answer:
6 hours
Explanation:
If it is traveling at 50mph and needs to reah 300 miles, to figure this problem out you would want to divide 300 by 50 to get 6 hours. So it will take six hours until the car travels 300 miles
Hope this helps.
Answer: A car travels at a rate of 50 miles per hour. how long will it take the car to travel 300 miles?
Explanation: .
Applying the distance formula:
d = rt
where
d is distance (300 miles)
r is rate (50 mph)
t is time (hours)
.
300 = 30t
300/30 = t
10 hours = t
can you guys help me
Answer:
B) 6 Newtons
Explanation:
Applied Force = 10 N
Resistive Frictional Force = 4 N
As we know that frictional forces always act in the opposite of the relative motion [force], and that opposite forces always subtract.
Hence,
The Net Force acting on the block = 10 N -4 N = 6 Newtons
Answer: The Answer is B
P3- is a(n) ______________________, so it ________________ valence electrons. Group of answ er choices anion, gained cation, gained cation, lost anion, lost
Answer: anion , gained
Explanation:
When an atom accepts an electron negative charge is created on atom and is called as anion.
When atom loses an electron positive charge is created on atom and is called as cation.
Phosphorous (P) has an atomic number of 15 which means it contains 15 electrons and there are 5 valence electrons.
For formation of , the atom of phosphorous (P) must gain three electrons in its valence shell 3p so as to complete its octet
[tex]P:15:1s^22s^22p^63s^23p^3[/tex]
[tex]P^{3-}:18:1s^22s^22p^63s^23p^6[/tex]
What is the single distinctive property of metals
Answer:
All metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metals; and have at least one basic oxide.
Explanation:
Answer:
All metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metals; and have at least one basic oxide.
Explanation:
According to Coulomb’s law, what will happen to the electric force between
two identical negative charges as they move closer together?
A. Fe will become negative and decrease in magnitude.
O B. Fe will stay negative and increase in magnitude.
C. Fe will stay positive and increase in magnitude,
D. Fe will become positive and decrease in magnitude.
Answer:
C. Fe will stay positive and increase in magnitude.
Explanation:
Coulomb's law states that the force of attraction of repulsion between two charged particles is directly proportional to the magnitude of their charges and inversely proportional to the square of the distance of separation between them.
This means that if the size of the charges are large, the force acting on them will be large as well. Also if the distance between the two charges increases the force decreases. However, the force increases when the distance of separation decreases.
Like charges repel, therefore, two negative charges brought together will repel each other, and the distance between the two charges decreases, the force will increase in magnitude. Forces of repulsion are considered positive, therefore, the force, Fe, will stay positive and increase in magnitude.
An independent variable is....
A: What we measure
B: What we change
C: What stays the same
D: What we conclude
Answer:
B - What we change
Explanation:
Dependent Variable - What we measure
Control Variable - what stays the same
Conclusion - what we conclude
Hope this can Help!
:D
What are the causes of soil erosion
Answer:
deforestation
Explanation:
our trees are very useful, it holds and keep our soil compact. so if deforestation takes place chances of flooding becomes high , and having lots of water softens soil and may cause erosin