Chapter 4. 1,2,3

Question 1

Atom

Answer 1

the smallest unit of an element that maintains the properties of that element

Question 2

Electron

Answer 2

a subatomic particle that has a negative charge

Question 3

Nucleus

Answer 3

in physical science, an atom’s central region, which is made up of protons and neutrons

Question 4

electron cloud

Answer 4

a region around the nucleus of an atom where electrons are likely to be found

Question 5

Proton

Answer 5

a subatomic particle that has a positive charge and that is found in the nucleus of an atom

Question 6

Atomic Mass Unit

Answer 6

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

Question 7

neutron

Answer 7

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

Question 8

Atomic Number

Answer 8

the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element

Question 9

Isotope

Answer 9

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

Question 10

Mass Number

Answer 10

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