C4.1

Chemical Calculations

Relative Masses

Learning Objectives

• Recall the periodic table, proton number and organisation

• Know what is meant by relative atomic mass

• Calculate relative formula mass

Multiple Choice

The mass number of an atom =

• protons + neutrons

• protons - neutrons

• electrons - neutrons

• neutrons + electrons

Multiple Choice

The number 18 represents the

• Atomic number

• Neutrons

• Element Name

• Element symbol

Multiple Choice

What is the element name?

• Argon

• Neon

• 18

• Ar

Multiple Choice

What is the element symbol?

• Argon

• Ar

• 18

• 39.948

Multiple Choice

What is the mass number of this Carbon atom?

• 8

• 12

• 6

• 15

Multiple Choice

What is the atomic number of this Carbon atom

• 6

• 8

• 14

• 12

Multiple Choice

The number of electrons in an atom is found by the

• protons

• atomic number

• protons and atomic number

• none

Multiple Choice

Where are electrons located in an element?

• nucleus

• energy levels

Multiple Choice

What type of charge does a neutron have?

• negative

• positive

• no charge/neutral

Multiple Choice

The number of neutrons in an atom =

• protons - neutrons

• mass number - protons

• protons - neutrons

• mass number - electrons

Multiple Choice

How do you find the atomic number?

• by the number of electrons

• by the number of protons

• by the number of neutrons

Multiple Choice

What two sub-atomic particles belong in the nucleus of an atom?

• electrons and protons

• protons and neutrons

• electrons and neutrons

Multiple Choice

What is the center of the atom called?

• nucleus

• electron cloud

• energy level

• neutron

Multiple Choice

What type of charge does an electron have?

• positive

• no charge/neutral

• negative

Multiple Choice

What type of charge does a proton have?

• negative

• postive

• no charge/neutral