Science 802 Quiz 2

Front 1

electron

Back 1

negative charge

Front 2

atom

Back 2

basic unit of matter

Front 3

energy levels

Back 3

three-dimensional orbits

Front 4

Niels Bohr

Back 4

drew first picture of atom

Front 5

electron cloud

Back 5

electrons reside here

Front 6

molecule

Back 6

atoms bonded

Front 7

1st energy level

Back 7

inner energy level

Front 8

John Dalton

Back 8

developed atomic theory

Front 9

number of energy levels

Back 9

seven

Front 10

proton

Back 10

positive charge

Front 11

The basic atom is neutral.

Back 11

true

Front 12

Density equals volume divided by mass.

Back 12

true

Front 13

Buoyancy is a general property of matter.

Back 13

false

Front 14

Most of the atomic mass is in the nucleus.

Back 14

true

Front 15

Valence electrons determine to what extent an atom can combine.

Back 15

true

Front 16

Electrons move in a single plane.

Back 16

false

Front 17

The 3rd energy level can hold 18 electrons.

Back 17

true

Front 18

The atomic mass of hydrogen is one.

Back 18

true

Front 19

The four natural elements are fire, air, earth, and water.

Back 19

true

Front 20

A molecule is made up of two or more elements.

Back 20

true

Front 21

How many electrons are in the 1st energy level of each atom?

Back 21

two

Front 22

How many electrons is each atom sharing?

Back 22

two

Front 23

How many protons are in each nucleus?

Back 23

eight

Front 24

How may electrons does each atom have in its second energy level?

Back 24

eight

Front 25

How many total electrons does each atom have?

Back 25

10 because they share two each

Front 26

The particle which is opposite in charge to the electron is the

Back 26

proton

Front 27

The state of matter in which the molecules are closest together is the ____________ phase.

Back 27

solid

Front 28

protons are found in the

Back 28

nucleus.

Front 29

A molecule of water is made up of

Back 29

three atoms

Front 30

The maximum number of energy levels in an atom is

Back 30

seven

Front 31

A molecule is formed when two or more atoms are

Back 31

combined.

Front 32

The particle that determines the mass of the atom, along with the proton, is

Back 32

neutron

Front 33

The force causing an object to float is called

Back 33

buoyancy

Front 34

Nearly all the mass of an atom is found in the

Back 34

nucleus

Front 35

The idea that all matter is made up of very tiny particles called atoms is the

Back 35

atomic theory