Question

Arrange each set in order of increasing atomic size:

Answer 1

Answer:

Part A:

Order: K<Rb<Cs

Part B:

Order: O<C<Be

Part C:

Order:CL<S<K

Part D:

Order:Mg<Ca<K

Explanation:

Atomic Size:

It is the distance from the center to atom to the valance shell electron. It is very difficult to measure the atomic size because there is definite boundary of atom.

Trend:

Moving from top to bottom in a group, Atomic Size increases.

Moving from left to right in a period, Atomic size generally decreases.

On the basis of above trend we will solve our question:

Part A:

All elements belong to Group 1:

Moving from top to bottom in a group, Atomic Size increases.

Order: K<Rb<Cs

Part B:

All elements belong to 2nd Period:

Moving from left to right in a period, Atomic size generally decreases.

Order: O<C<Be

Part C:

S belongs to 3rd Period, K, Cl belong to 4th period

Order:CL<S<K

Part D:

Mg is above Ca in group 2 and K is before Ca in 4th period

From trends described above:

Order:Mg<Ca<K