Atomic Structure

Question 1

What are the three types of sub-atomic particle in an atom?

Answer 1

Protons, neutrons and electrons

Question 2

What charges do sub-atomic particles have?

Answer 2

Proton = +1
Neutron = 0
Electron = -1

Question 3

What is the mass number?

Answer 3

The total number of protons and neutrons

Question 4

What is the atomic number?

Answer 4

Total number of protons

Question 5

How many electrons fit on the first three shells of an atom?

Answer 5

2,8,8

Question 6

What do all atoms in the same period have in common?

Answer 6

Same number of shells

Question 7

What do atoms in the same group have in common?

Answer 7

Same number of electrons in the outer shell

Question 8

What is an isotope?

Answer 8

Atoms with the same number of protons and a different number of neutrons

Question 9

Define the relative atomic mass?

Answer 9

The mass of an element compared to the mass of a carbon atom with the exact mass of 12

Question 10

How can you calculate relative molecular mass?

Answer 10

Add together the atomic masses of every atom in the molecule

Question 11

Calculate the percentage of aluminium in Al2O3 when Al=27 and O=16

Answer 11

52.9% aluminium

Question 12

Calculate the molecular mass of a molecule of water

Answer 12

18