Chapter 4

Question 1

Atoms

Answer 1

Democritus

Question 2

Electrons

Answer 2

Thomson

Question 3

Nucleus

Answer 3

Rutherford

Question 4

Modern Atomic Theory

Answer 4

Bohr

Question 5

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

Answer 5

Atom

Question 6

a subatomic particle that has a negative charge

Answer 6

Electron

Question 7

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

Answer 7

Nucleus

Question 8

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

Answer 8

Electron Cloud

Question 9

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

Answer 9

Proton

Question 10

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

Answer 10

Atomic Mass Unit

Question 11

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

Answer 11

Neutron

Question 12

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

Answer 12

Atomic Number

Question 13

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.

Answer 13

Isotope

Question 14

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

Answer 14

Mass number

Question 15

Atomic Theory

Answer 15

Dalton