ICSE Class 10 Chemistry 2023 Solved Paper

Arrange the following as per the instruction given in the brackets:

Question : 37 of 88

Marks: +1, -0

Al, K, Mg, Ca (decreasing order of its reactivity)

Solution:

{\K}> {\Ca}> {\Mg}> {\Al}

.
The reactivity of elements depends upon their tendency to lose or gain electrons to complete their outer most shell. On moving left to right in a period reactivity decreases and down the group increases. So

{\Ca}

and

{\Mg}

both belongs to

2^{\;\text"nd "\;}

group but have different periods.

{\Mg}

is in

3^{\;\text "rd "\;}

period and

{\Ca}

is in

4^{\;\text "th "\;}

period.

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