3.1 The Mass Of Atoms

Question 1

Why is the mass of an atom almost entirely made up of its protons and neutrons?

Answer 1

Because the mass of electrons is very small in comparison so we think of it as almost 0

Question 2

What is an atoms mass number?

Answer 2

The total mass of protons and neutrons

Question 3

What is an atoms atomic number?

Answer 3

The number of protons/electrons in an atom (they are the same number)

Question 4

What are isotopes?

Answer 4

Atoms of the same element with different numbers of neutrons

Question 5

How do we work out the number of neutrons in an atom?

Answer 5

Mass number - the atomic number

Question 6

Where an we say an atoms mass is concentrated?

Answer 6

In its nucleus

Question 7

What can extra neutrons sometimes cause in atoms?

Answer 7

The isotopic atoms could become unstable and radioactive

Question 8

What type of properties could differ between different isotopes of an atom?

Answer 8

Physical

Question 9

What type of property will always be the same in isotopes of an atom?

Answer 9

Chemical

Question 10

Why are protons and neutrons relative masses both 1?

Answer 10

Because they have the same mass