The atomic radius of an element can be predicted based on its periodic propertie

Question

The atomic radius of an element can be predicted based on its periodic properties. Atomic radiiincrease going down a group in the periodic table, because successively larger valence-shell orbitals are occupied by electrons. Atomic radii generallydecrease moving from left to right across a period because the effective nuclear charge increases.

Rank the following elements in order of decreasing atomic radius.

Rank from largest to smallest radius. To rank items as equivalent, overlap them.

Mg - Sr - Ca - Be

Rank the following elements in order of decreasing atomic radius.

Rank from largest to smallest radius. To rank items as equivalent, overlap them.

C - F - O - B

Explanation / Answer

Answer – In this question there are given elements and we need to rank increase or decreasing order in atomic radius.

We know in the periodic table in the period from the left to the atomic radius gets decreased and in the group it is increased from top to bottom.

So Order of decreasing atomic radius means largest to smallest radius for –

Mg - Sr - Ca - Be

These all elements given are the for IIA group and we know in the group atomic radius increase from top to bottom,

So Be has the smallest atomic radius and Sr has largest atomic radius

So rank is as follow -

Sr >Ca> Mg > Be

Now for the elements given, C - F - O - B

Theses element from the 2nd period in the periodic table and we know in the period from the left to the atomic radius gets decreased

So F has the smallest atomic radius and B has the largest atomic radius

So rank from largest to smallest radius is –

B > C > O > F

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