Isotopes Practice

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

• ion

• mixture

• isotope

• neutral atom

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.

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

• 16
• 32
• 48
• 64

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

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

• p^- e⁺ n⁰

• p⁺ e n^-

• p⁺ e^- n⁰

• p^- e⁺ n⁰

What is the atomic number of this element?

• 12

• 24

• 23

What subatomic particles would you find in the nucleus of an atom?

• Protons only
• Protons and Neutrons
• Neutrons and Electrons
• Protons and Electrons 

What subatomic particle is electrically neutral (no charge)?

• Proton
• Ion
• Neutron
• Electron

What subatomic particle(s) would be found orbiting the nucleus?

• Neutrons only
• Electrons only
• Protons and Neutrons
• Protons and Electrons

Which subatomic particles contribute the most to the mass of an atom?

• Protons, Neutrons, Electrons
• Protons only
• Protons and Electrons
• Protons and Neutrons