Elements of Groups 16, 17 and 18 — Chemistry STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElements of Groups 16, 17 and 182 Marks
Question
How does the atomic radii and ionisation enthalpy vary across a period?
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Answer
The atomic or ionic radii decreases across a period with increase in atomic number and increase in the effective nuclear charge $\left(Z_{\text {eff }}\right)$.
The ionisation enthalpy also increases across a period with increase in atomic number. This is due to addition of electrons to the same shell, while moving across a period.
Inert element at the end of period has the highest value of ionisation enthalpy.
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