Isotopes and Avg. Atomic Mass

Adding or subtracting neutrons makes the element change into a(n)...

• ion

• mixture

• isotope

• neutral atom

Tags

NGSS.HS-PS1-8

The atomic mass is equal to _.

• the number of protons only
• the number of neutrons only
• the total number of protons and neutrons
• the number of protons, neutrons, and electrons.

An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?

• 9.012, Beryllium
• 12.011, Carbon
• 6.941, Lithium
• 10.812, Boron

If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:

• 16
• 32
• 48
• 64

Tags

NGSS.MS-PS1-1

On the periodic table, how is atomic mass represented?

• As an average of the mass of different isotopes
• as the exact mass of every atom
• as the mass of the most common isotopes
• As the masses of all protons added together

What do carbon-12 and carbon-14 have in common?

• they have same number of protons
• they have the same number of neutrons
• they have the same atomic mass
• they have the same atomic weight

Tags

NGSS.HS-PS1-8

If neutral copper atom (atomic number 29) becomes an ion that has a charge of 2+, how many electrons does the resulting ion have?

• 27
• 28
• 29
• 31

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which answer choice describes the subatomic particles and their respective charges?

• p^- e⁺ n⁰

• p⁺ e n^-

• p⁺ e^- n⁰

• p^- e⁺ n⁰

In a correctly written symbol what would be located in the "A" position?

• number of neutrons
• atomic number
• number of electrons 
• mass number

Tags

NGSS.HS-PS1-8

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

Tags

NGSS.HS-PS1-8