Chemistry 9 chapter 3

Valence electrons of 3A group

• 1

• 2

• 3

• 4

Symbol of Gallium

• Ga

• Al

• Gl

• Gu

The elements of this group are metals except boron is............

• Non metal

• Metalloid

• Metal

• Noble gas

The ionization energy of 3A is less than the ionization energy of 2A

• True

• False

Oxidation number of 3A group is........

• +2

• -3

• +3

• +1

The aqueous solutions of boron oxides are acidic, whereas the aluminum oxides are...............

• Noble gas

• Amphoteric

• Halogen

• Alkali metal

• Boron

• Gallium

• Aluminum

• Indium

• Boron

• Aluminum

• Gallium

• Indium

Electron configuration of Aluminum

Al13

• 1s2 2s2 2p6

• 1s2 2s2 2p6 3s1

• 1s2 2s2 2p6 3s2

• 1s2 2s2 2p6 3s2 3p1

Aluminum is the most abundant metal in the................

• Air

• Sea

• Earth's crust

• Atmosphere