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What generally happens to atomic size from left to right in a period?

Answer and explanation

Correct answer: It decreases.

From left to right across a period, the number of protons increases while the added electrons enter the same main shell. The effective nuclear charge therefore increases and pulls the electrons closer to the nucleus, so atomic size decreases. Option B states the opposite trend. Exam tip: atomic radius decreases across a period but increases down a group.

Related tags

Atomic SizeAtomic RadiusPeriodic TrendsEffective Nuclear ChargePeriodic TableClass 10 ScienceModern Periodic Table And Periodic LawPeriodic Classification Of Elements

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