OnlineCBT
Chemistry · Classification of Elements and Periodicity in Properties
हिन्दीGiven below are two statements: Statement I: The atomic radius generally decreases across a period from left to right due to an increase in effective nuclear charge. Statement II: The atomic radius within a group/vertical column decreases regularly with an increase in atomic number. In the light of the above statements, choose the most appropriate answer from the options given below:
Correct answer · Option 3
Statement I is correct but Statement II is incorrect.
Explanation
Statement I is correct because effective nuclear charge increases across a period. Statement II is incorrect because atomic radius increases (not decreases) down a group due to the addition of new principal energy shells.
