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Why does the ...

Question

Why does the size of atom increases as we go down the group?

A

The number of electrons increase

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B

The new shells are added

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C

The nuclear force increases

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D

The number of electrons decrease

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Solution

The correct option is B The new shells are added
On moving down the group, new shells are being added. The nuclear charge is not enough to reduce the size enough. So the radius increases as we move down the group.

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Q. When we will go down in a group in periodic table than electrons and number of shells will increase. and number of protons will also increase then nuclear charge of particular atom of element will increase or not?

Q. The amount of energy released when an atom in the gaseous state accepts an electron to form an anion. factor which affect electron affinity are: atomic size and Nuclear charge. As atomic radii increases, electron affinity increase. As nuclear charge increase, electron affinity increase. it decrease down a group and increases across a period. Explain.

STATEMENT-1 : Shielding effect increases as we go down the group.
STATEMENT-2 : With an increase in the number of electrons in the penultimate shell, shielding effect increases.

Q. Assertion :Shielding effect increases as we go down the group. Reason: More is the number of electrons in the penultimate shell, more is the shielding.

Q. Assertion :Atomic size decreases across period but increases down a group of the periodic table. Reason: Moving from left to right across a period, electrons are added one at a time to the outer energy shell. Electrons within a shell cannot shield each other from the attraction to protons, while moving down a group in the periodic table, the number of electrons and filled electron shells increases.

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