Match the following terms with their correct definitions:

• Neutron

• Negatively charged component of an atom.

• Nucleus

• Neutral component of an atom.

• Electron shell

• Centre of the atom composed of protons and neutrons.

• Proton

• Positively charged component of an atom.

• Electron

• Where you will find an electron.

What is the electron configuration of Magnesium?

• 2,8,2

• 2,6,4

• 2,8,4

• 2,7,3

What is the electron configuration of Argon?

• 2,8,8

• 2,8,7

• 2,8,6

• 2,8,2

What is the electron configuration of Sodium (Na)?

• 2,8,1

• 2,7,2

• 2,8,2

• 2,6,3

What is the electron configuration of Aluminium (Al)?

• 2,8,3

• 2,8,2

• 2,7,4

• 2,8,4

What is the electron configuration of Beryllium (Be)?

• 2,2

• 1,3

• 4,0

• 2,1

What is the electron configuration of Potassium (K)?

• 2,8,8,1

• 2,8,7,2

• 2,8,8,2

• 2,8,6,3

The periodic table is arranged according to which of the following?

• Atomic number

• Atomic mass

• Alphabetical order

• Date of discovery

Sodium is very reactive because:

• It has a full outer shell of electrons

• It easily loses one electron to achieve a stable configuration

• It gains electrons easily

• It is a noble gas

Losing electrons results in a positive charge.

• True

• False