Atoms, Isotopes and Ions

Two atoms of different elements will definitely have different numbers_____

• Nuclei
• Protons
• Neutrons
• Electrons

Which particle is NOT made up of quarks?

• Protons
• Neutron
• Electron

Although carbon's three isotopes are carbon-12, carbon-13, and carbon-14, its average atomic mass is 12.01 because

• Carbon-12 is the heaviest isotope
• Carbon-12 is the most useful to humans
• Carbon-12 is the most common isotope

An ion forms when an atom gains or loses

• Protons
• Neutrons
• Electrons

A neutral atom would become an ion that has a charge of 2+ by 

• Losing two protons
• Losing two neutrons
• Losing two electrons

An alpha particle consists of 

• Energy only
• 1 high-energy electron
• 1 proton and 1 electron
• 2 protons and 2 neutrons

Isotopes are atoms that have different

• Mass numbers
• Element names
• Atomic Numbers

A positively charged ion is formed when

• A neutron is lost
• An electron is lost
• A neutron is gained
• An electron is gained

Two atoms that have different numbers of protons are 

• Different ions
• Different isotopes
• Different elements

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