Atoms

Question 1

What does the nucleus contain?

Answer 1

protons and neutrons.

Question 2

How do you work out the number of neutrons?

Answer 2

Mass number,A - Atomic number,Z

Question 3

What are isotopes?

Answer 3

Isotopes have the same atomic number but different mass numbers.
Isotopes have the same number of protons and electrons but a different number of neutrons.

Question 4

Why are isotopes chemically identical?

Answer 4

They are chemically identical because they have the same number of electrons.

Question 5

What is the relative mass and charge of an electron?

Answer 5

Relative mass = 1/1836 and the relative charge is -1.

Question 6

What is the relative mass and charge of a proton?

Answer 6

Relative mass = 1 and the relative charge is +1.

Question 7

What is the relative mass and charge of a neutron?

Answer 7

Relative mass = 1 and the charge is 0.

Question 8

Why do isotopes have different physical properties?

Answer 8

This is because they have different masses e.g.
Cl 37 has:
slower rate of diffusion, A higher density, A higher mass, A higher melting and boiling point.