GCSE Chemistry - Electron Arrangement #8

The video tutorial explains the arrangement of electrons in atoms, focusing on the importance of a full outer shell for stability. It covers the electron configurations of sodium, argon, calcium, and fluorine, highlighting how atoms achieve stability through reactions or forming ions. Noble gases are discussed as exceptions due to their naturally full outer shells. The tutorial also provides methods for drawing electron arrangements and understanding the formation of ions.

What is the main reason atoms like sodium are considered unstable?

• They have too many protons.

• Their outer shell is not full.

• Their inner shell is incomplete.

• They have an excess of neutrons.

Why do noble gases like neon not react with other elements?

• They have more protons than electrons.

• They lack neutrons in their nucleus.

• They have an incomplete inner shell.

• They have a full outer shell of electrons.

How many electrons are in the outer shell of argon?

• 10

• 2

• 6

• 8

What happens to a calcium atom when it loses two electrons?

• It gains two protons.

• It becomes a calcium ion with a 2+ charge.

• It forms a negative ion.

• It becomes a neutral atom.

What is the electron configuration of calcium after it loses two electrons?

• 2, 8, 6

• 2, 8, 2

• 2, 8, 8, 2

• 2, 8, 8

How does fluorine achieve a stable electron configuration?

• By losing one electron.

• By gaining one electron.

• By sharing electrons with another atom.

• By losing two electrons.

What charge does a fluoride ion have after gaining an electron?

• +1

• +2

• -1

• 0