Question

AlCl3 is formed when one atom of Aluminum combines with three atoms of Chlorine, the valency
of Aluminium is_____

Answer 1

Answer:

3

Explanation:

Since the atomic number of aluminium is 13

Hence 3 electrons will be left in its outermost shell

Answer 2

Answer

Valency of Aluminium is +3.

(Since, there are 13 electrons in Aluminium (2,8,3) and in outer most shell there are 3 electrons. Therefore, the valency of the Aluminium is 3.)

$\rule{100}2$

Additional Information

• Atomic mass of Aluminium is 27 atomic mass units. (Atomic mass is the sum of number of protons and of neutrons.)
• It contains 13 protons, 14 neutrons and 13 electrons in it.
• It's symbol is Al.
• It's melting point is 1221 °F
• It is silver-white in colour.
• It is a soft and light metal (ductile in nature)
• It can be recycled again.
• It is the most abundant metal in the earth's crust.
• Mostly found in Feldspars (rocks).
• It's period number is 3 and group number is 13.
• It's weight is about ⅓ of steel.
• Good conductor of both electricity and heat.
• Used to make toys, decorative papers etc.