Question

The atomic number of an element X is 12.

(a) Write its electronic configuration and determine its valency.

(b) Is it more reactive or less reactive than Ca (atomic number 20)? Justify your answer given reason.

(c) Is it a metal or a non-metal?

(d) Write the formula of its oxide.

Answer 1

configuration is 2 8 2
valency is minus 2
no its is not reactive than calcium
its is metal
xo is formula



mark it brainliest

Answer 2

a) 2,8,2
it's valency is +2

b) less reactive than calcium
Among the alkali metals and alkaline earth metals, reactivityincreases with the atomic number Z (that is, as you move down their columns in the periodic table). So, in your list,calcium (Z = 20) is more reactive than magnesium (Z = 12), and both are more reactive than iron or zinc.

c) metal

d) XO [because the valency of X as obtained from above is 2 and valency of oxide is also 2]
(The element having atomic no 12 is Mg...therefore it's oxide will be MgO)