BGE - Atomic No. & Mass No.

Label the pictured atom.

a

b

c

d

e

Neutron

Proton

Energy Shells

Electron

Nucleus

What is the atomic number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

What is the mass number defined as?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

What is the atomic number of this atom?

• 1
• 3
• 4
• 7

What is the mass number of this atom?

• 1

• 3

• 4

• 7

How many electrons are in an atom with an atomic number of 50?

• 5

• 8

• 50

• 2

A fluorine atom has 9 protons and 10 neutrons. What is the atomic number of fluorine?

• 9
• 10
• 19
• 1

A phosphorus atom has 15 protons and 16 neutrons. What is the mass number?

• 15
• 16
• 31
• 1

Match the answers to each part.

• Mg

• Mass Number

• 24

• Atomic No

• 12

• Symbol

Sodium has an atomic number of​ (a)   which means it has 11​ (b)   . Sodium has a mass of​ (c)   and this means that this atom has​ (d)   neutrons.

• 23
• 11
• protons
• 12
• 10
• 13
• 14
• electrons
• neutrons