C1.6/C1.7 - Structure of Atom + Isotopes and Ions

Question 1

Relative charge Relative mass

Proton :

Neutron:

Electron:

Answer 1

Relative charge Relative mass

Proton : +1 1

Neutron: 0 1

Electron: -1 Very small

Question 2

What is the top number and the bottom number for an element? What are they for?

Answer 2

Top number : Mass number = protons + neutrons
Bottom number : Atomic number = protons = electrons

Question 3

What are isotopes?

Answer 3

Atoms of an element with different numbers of neutrons.

Question 4

What are ions?

Answer 4

Atoms which have an overall charge. Either gained or lost electrons.

Question 5

Why do different isotopes have different physical properties and the same chemical properties?

Answer 5

Different isotopes have different physical properties (eg different density) however have the same chemical properties because that depends on the arrangement and behaviour of the electrons in an atom.