What is the number of protons equal to?

• The atomic number

• mass number

• atomic mass

• isotope

The average mass of all the isotopes of an element is defined as what?

• atomic number

• atomic mass

• proton number

• mass number

What is an ion?

• an atom with a positive or negative charge

• an isotope

• an atom with a different number of neutrons than others

• change in number of protons on an atom

When an atom gains or loses an electron it becomes an _____.

• isotope

• oxygen

• ion

• neutron

Which of the following is a noble gas?

• oxygen

• iron

• hydrogen

• neon

Which element is an alkali metal?

• lithium

• cobalt

• mercury

• calcium

Which element is an alkaline earth metal?

• lithium

• vanadium

• carbon

• calcium

Which element is a halogen?

• helium

• hydrogen

• flourine

• oxygen

What is the ability to make sheets out of metal?

• ductility

• conductivity

• malleablility

• solubility

What is the ability to make metal into wires?

• ductility

• conductivity

• malleablility

• solubility