Chapter 11 Section 2 Vocab Words

Question 1

Electron

Answer 1

A negatively charged subatomic particle

Question 2

Proton

Answer 2

Positively charged that appears in an atoms nucleus

Question 3

Atomic Mass Unit(amu)

Answer 3

a unit of mass that describes the mass of an atom or molecule

Question 4

Neutron

Answer 4

a subatomic particle that has no charge and that is found in the nucleus of an atom

Question 5

Atomic Number

Answer 5

the number of protons in the nucleus of an atom

Question 6

Isotope

Answer 6

an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)

Question 7

Mass Number

Answer 7

the sum of the numbers of protons and neutrons in the nucleus of an atom

Question 8

Atomic Mass

Answer 8

the mass of an atom expressed in atomic mass units

Question 9

Ion

Answer 9

An ion is an atom or a molecule in which the total number of electrons is not equal to the total number of protons, giving the atom or molecule a net positive or negative electrical charge.