Factors determining size & important question answer

Factors determining size:

1 Number of shell: more are the no. of shells bigger is the size of atomic.

2 Number of protons: if no. of shells are same, more are the no. of protons, smaller in size of atom.

3 Number of electron: if the no. of shells and no. of protons are same, more are the no. of electron bigger is the size of atom.

Question & Answer

Question 1

Radii of action is smaller than corresponding atom?

ans:

cation is formed by loss of electron. magnitude of nuclear charge remain same .but no. of electron is decrease as a result effective nuclear charge increase so electron are more attracted by nucleus. this cause decrease in size hence cations are smaller than corresponding atom

for eg.

Na^+1<Na Al^+1<Al etc

Question 2

Radii of anion is bigger than corresponding atom?

ans:

anion is formed by gain of electron. magnitude of nuclear charge remains same but no. of electron is increase as a result of effective nuclear charge decreases so expansion of electron take place. this cause increase in size .
hence anion is bigger than corresponding atom

Comments

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