Unit 6 Test Review 22-23

Which of the following is true regarding the charges of subatomic particles?

• e(-)

  p(+)

  n(0)

• e(+)

  p(0)

  n(-)

• e(0)

  p(-)

  n(+)

• e(-)

  p(+)

  n(+)

Carbon has _ electrons and protons.

Which subatomic particle determines the identity of an element?

• electrons

• nucleus

• protons

• neutrons

Which of the following is true regarding Ca⁺²?

• Ca⁺² has 22 protons.

• Ca⁺² has 22 electrons.

• Ca⁺² is neutral.

• Ca⁺² has 18 electrons.

Which of the following is an ion that has gained 3 electrons?

• ³He

• Al^-3

• Al⁺³

• Li

How many electrons does Sr⁺² have?

• 87

• 38

• 40

• 36

Carbon-14 is a stable ion.

• False

• True

Answer explanation

Carbon-14 is an unstable (radioactive) isotope.

How many neutrons are in the nucleus of C-14?

• 12

• 14

• 6

• 7

Answer explanation

Remember! The total mass number is equal to the sum of protons and neutrons in the nucleus of an atom.

Cl-35 has a percent abundance of 75.77% and Cl-37 has a percent abundance of 24.23%. Which of the following is incorrect?

• Cl-35 and Cl-37 both have 17 electrons.

• Chlorine is found in period 3 of the periodic table.

Bohr's planetary model of the atom demonstrates that electrons ___ the nucleus.