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Science · 2022 · 2 marks
CBSE 2022 · Region 4 · Set 1 · Q1
Explain giving reason why although the nuclear charge in atoms increases in moving from left to right in a period as well as in moving from top to…
Explain giving reason why although the nuclear charge in atoms increases in moving from left to right in a period as well as in moving from top to bottom in a group in the Modern periodic table, but the size of the atoms does not vary similarly in both situations.
Marking-scheme solution
On moving from left to right in a period, the increase in nuclear charge tends to pull electrons closer to the nucleus and reduces the size of the atom, whereas in in a group moving from top to bottom new shells are being added which increases the distance between the outermost electrons and the nucleus, hence increases the size of the atom.
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