Chapter 4 - Introduction to Atoms

Question 1

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

Answer 1

atom

Question 2

a subatomic particle with a negative charge

Answer 2

electron

Question 3

the atoms central region

Answer 3

nucleus

Question 4

a region around the nucleus where electrons can be found

Answer 4

electron cloud

Question 5

a subatomic particle that has a positve charged (inside nucleus)

Answer 5

proton

Question 6

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

Answer 6

atomic mass unit

Question 7

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

Answer 7

neutron

Question 8

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

Answer 8

atomic number

Question 9

an atom that has the same number of proton or same atomic number as other atoms but has a different number of protons

Answer 9

isotope

Question 10

the sum of the #’s of protons and neutrons in the nucleus of and atom

Answer 10

mass number

Question 11

the mass of an atom expressed in atomic mass units

Answer 11

atomic mass

Question 12

the one who thought if you kept cutting you would end up with a particle that could not be cut

Answer 12

Democritus

Question 13

British chemist and school teacher; experimented with different substances

Answer 13

Dalton

Question 14

discovered there are small particles inside the atom.

Answer 14

Thomson

Question 15

studied the ways reacted to light

Answer 15

Bohr

Question 16

believed you couldn’t end up with a particle that couldn’t be cut

Answer 16

Aristotle

Question 17

studied parts of an atom, did gold foil experiemnt

Answer 17

Rutherford