Atomic Unit Review

Which element is most chemically reactive?

• Be

• Ba

• Mg

• Sr

Group 7a (VII) is know as what family?

• Alkali metals

• Noble gases

• Halogens

• Transition metals

Group 2a (II) is known as what family?

• Alkali metals

• Alkaline earth metals

• Transition metals

• Metalloids

What subatomic particle is located on the outside of the nucleus?

• protons

• neutrons

• electrons

• quarks

Metals are found where on the periodic table?

• to the left

• to the right

• in the middle

How many electrons are in oxygen?

• 15.9

• 6

• 8

• 2

How many protons are in oxygen?

• 15.9

• 6

• 8

• 2

How many neutrons are in oxygen?

• 15.9

• 6

• 8

• 2

How many neutrons are in strontium?

• 38

• 87

• 2

• 49

which gas is least reactive?

• Hydrogen

• Argon

• Oxygen

• Nitrogen