Chapter 3: Atomic Structure

Question 1

What are the relative masses of the sub-atomic particles?

Answer 1

Proton: 1
Neutron: 1
Electron: 1/1840

Question 2

What are the relative charges of the sub-atomic particles?

Answer 2

Protons: 1+
Neutron: 0
Electrons: 1-

Question 3

Where can the sub-atomic particles be fouund in the atom?

Answer 3

Proton: In the nucleus
Neutron: In the nucleus
Electron: Electron shell

Question 4

How to identify nucleon and proton number?

Answer 4

Nucleon number is the bigger number, proton number is the smaller number.

Question 5

What are other names for nucleon and proton number?

Answer 5

Nucleon: Mass/ Atomic mass number
Proton: Atomic number

Question 5

Why are atoms mostly made up of empty space?

Answer 5

1. Most of the mass, which are the protons and neutrons, are concentrated in the nucleus.
2. Electrons, being smaller, are located around the nucleus in electron shells

Question 6

Define ‘isotopes’

Answer 6

Atoms of the same element that have different number of electrons, but same number of protons.

Question 6

Why are atoms electrically neutral?

Answer 6

There will be an equal number of protons and electrons in an atom thus, they will cancel out each other.

Question 7

What do chemical properties depend on?

Answer 7

Number of valence electrons

Question 8

What do physical properties depend on?

Answer 8

Number of neutrons.