Mid ter

An atom's atomic number represents the

• number of neutrons

• number of protons

• number of electrons

• number of voltrons

Strontium fluoride (SrF₂) is classified as a(n):

• element

• compound

• heterogeneous mixture

• homogeneous mixture

Tags

NGSS.MS-PS1-1

Water (H₂O) is classified as a(n):

• element

• compound

• heterogeneous mixture

• homogeneous mixture

Tags

NGSS.MS-PS1-1

Corn flakes would be classified as a(n):

• element

• compound

• heterogeneous mixture

• homogeneous mixture

Tungsten (W) would be classified as a(n):

• element

• compound

• heterogeneous mixture

• homogeneous mixture

An ion is an example of:

• an atom that has lost electrons

• an atom that has gained electrons

• an atom that has gained protons

• an atom that has lost protons

Which atom below would be an isotope of sodium with a mass number of 23?

• atomic number: 12, # of neutrons: 11, # of electrons: 6

• atomic number: 11, # of neutrons: 6, # of electrons: 6

• atomic number: 11, # of neutrons: 11, # of electrons: 12

• atomic number: 11, # of neutrons: 12, # of electrons: 11

Tags

NGSS.MS-PS1-1

An atom's nucleus is

• positively charged

• negatively charged

• neutral (not charged)

• constantly charging

Tags

NGSS.HS-PS1-8

How many valence electrons does oxygen have?

• 16

• 6

• 8

• 3

Magnesium is a(n):

• alkali metal and very reactive

• halogen and very reactive

• alkali earth metal and reactive

• noble gas and very unreactive