Question

An element Barium has atomic number 56. Look up
its position in the Periodic Table and answer the
following questions.
(i) Is it a metal or a non-metal ?
(ii) Is it more or less reactive than calcium ?
(iii) What is its valency?
(iv) What will be the formula of its phosphate ?
(v) Is it larger or smaller than caesium (Cs) in size​

Answer 1

Answer:

Explanation:

1 metal

2 Calcium is less reactive than barium

3  valency 2

4 Ba3(PO4)2

5. Caesium is larger than Barium

Answer 2

Answer:

I) Since it belongs to group II, it has 2 valence electrons and hence it is a metal.

ii)Barium is placed below calcium in the group. Since, it has more number of shells; it is easier for it to lose its valence electrons to complete its octet configuration. Hence it is more reactive than calcium.

iii)It needs to lose its 2 valence electrons to complete its octet configuration; therefore its valency is also 2.

iv)The formula of its phosphate will be (Ba)3 (PO4)2.

v)As we move from left to right in a period, the size decreases, therefore, it will be smaller than Cesium.