Module 1 - 1.1.1 Atoms

Question 1

What are Atoms made up of?

Answer 1

Neutrons, electrons and protons.

Question 2

Explain what Electrons are.

Answer 2

Electrons are subatomic particles with a -1 charge. They revolve around the nucleus in orbitals. The orbitals take up most of the volume of the atom.

Question 3

What does the nucleus of an atom contain?

Answer 3

This is where most of the atom’s mass is concentrated. The diameter of the nucleus is however small compared to the whole atom. The nucleus is where Protons (+1 charge) and neutrons (0 charge) are found.

Question 4

What is the relative mass of each subatomic particle?

Answer 4

Proton = 1
Neutron = 1
Electron = 1/2000 (negligible)

Question 5

What are isotopes?

Answer 5

Isotopes are atoms of the same element with different Numbers of neutrons.

Question 6

What is relative atomic mass?

Answer 6

The average mass of an atom of an element on a scale where an atom of carbon-12 is 12.

Question 7

What is relative isotopic mass?

Answer 7

The mass of an isotope of an element on a scale where an atom of carbon-12 is 12.

(% abundance1 x relative atomic mass1) + (% abundance1 x relative atomic mass1) DIVIDED BY 100.

Question 8

What is relative molecular mass?

Answer 8

The average mass of a molecule or formula unit on a scale where an atom or carbon- 12 is 12.