10-5

What does the atomic number represent?

• the number of protons

• the number of protons and neutrons

• the number of nuetrons

• the weighted average of isotopes

What is the mass number described as?

• the number of protons

• the number of protons and neutrons

• the number of electrons

• the number of protons and electrons

What is the atomic # of this atom?

• 1

• 3

• 4

• 7

What is the mass # of this atom?

• 1

• 3

• 4

• 7

What is the atomic number of Barium, Ba? (you can enlarge table)

• 20

• 137

• 38

• 56

How many protons are in a sodium atom (Na)?

• 1

• 3

• 11

• 0

How many ELECTRONS are in an ATOM with an atomic # of 50.

• 5

• 8

• 50

• 2

Which atom has 4 neutrons?

• Li-6

• Li-7

• Li-8

• They have the same # of neutrons

What is the number of protons that the element in this image contain?

• 14

• 7

• 15

• 18

Elements of an atom will always have the same number of protons. (8 protons will always be Oxygen)

• True

• False