Question

The atomic number of x and y are 5 and 13 predict
a) The group
b) The period
c) Valency

Answer 1

The first element with atomic no.5 is boron

Valency is +3

Group is 13

Period is 2

The second element is with atomic no.13 is aluminium

valency is +3

Group is 13.

Period is 3

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Answer 2

For the element with atomic number 5

a) The group- 3a

b) The period-2

c) Valency-+3

for the element with atomic number 13

a) The group-3A

b) The period-3

c) Valency-+3

Explanation:

• The element with atomic number 5 is equal to board on. Boron has two orbit and as a result of this the period number is equal to 2.

• In addition to this it has a valency of 3. On the other hand the element with atomic number 13 is aluminium. Aluminium has the group number of three which is equal to that of boron and the period number is also three because it has three orbital. The valency is also equal to 3

to know more about aluminium

Why aluminium does not react with foods inside aluminium pots

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