Question

calcium, magnesium and strontium have been put together in the same group of periodic table on the basis of their similar chemical properties.

a)mention those properties(any two)
b)out of these three elements, which one will have atom of biggest size and why?

Answer 1

all 3 of them come under the same group. all three of them are metals. thetsy have the same valency.

Strontium will have because its atomic size increases down the group because a new shell is added down the group.

Answer 2

a) The similar chemical properties are ;
- All of them are alkali earth metal
- All of them loses two Electron to attain completely filled last shell that is they form 2+ ,cations
- All of them has Valency 2

b) Out of this three 'strontium' will have larger Atomic size, because strontium belongs to higher period and as we move down the group new shells are added up and hence Atomic size increases.
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