NEET UG 2010 — Chemistry Inorganic Chemistry

2010mcqeasy

Among the elements $\mathrm{Ca}, \mathrm{Mg}, \mathrm{P}$ and $\mathrm{Cl}$ , the order of increasing atomic radii is

Official previous-year question

Held on 30 Apr 2010 · Verified 9 Jul 2026.

Options

A
$\mathrm{Mg} < \mathrm{Ca} < \mathrm{Cl} < \mathrm{P}$
B
$\mathrm{Cl} < \mathrm{P} < \mathrm{Mg} < \mathrm{Ca}$
C
$\mathrm{P} < \mathrm{Cl} < \mathrm{Ca} < \mathrm{Mg}$
D
$\mathrm{Ca} < \mathrm{Mg} < \mathrm{P} < \mathrm{Cl}$

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Solution

With increase in the number of electrons in the same shell, the atomic radii decreases due to increase in effective nuclear charge. However, atomic radii increases, as the number of shells increases. Thus, on moving down a group atomic radii increases. The electronic configuration of the given elements is $\begin{aligned} \mathrm{Mg}_{12} & =[\mathrm{Ne}] 3 \mathrm{~s}^2 \\ \mathrm{Ca}_{20} & =[\mathrm{Ar}] 4 \mathrm{~s}^2 \end{aligned}$ $\begin{array}{r} \mathrm{P}_{15}=[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^3 \\ \mathrm{Cl}_{17}=[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^5 \end{array}$ In $\mathrm{Mg}, \mathrm{P}$ and $\mathrm{Cl}$ , the number of electrons are increasing in the same shell, thus the order of their atomic radii is $\mathrm{Cl} < \mathrm{P} < \mathrm{Mg}$ In $\mathrm{Ca}$ , the electron is entering in higher shell, thus, it has the highest atomic radii among the given. Thus, the order of radii is $\mathrm{Cl} < \mathrm{P} < \mathrm{Mg} < \mathrm{Ca}$

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NEET UG 2010 — Chemistry Inorganic Chemistry

2010mcqeasy

Among the elements $\mathrm{Ca}, \mathrm{Mg}, \mathrm{P}$ and $\mathrm{Cl}$ , the order of increasing atomic radii is

Official previous-year question

Held on 30 Apr 2010 · Verified 9 Jul 2026.

Options

A
$\mathrm{Mg} < \mathrm{Ca} < \mathrm{Cl} < \mathrm{P}$
B
$\mathrm{Cl} < \mathrm{P} < \mathrm{Mg} < \mathrm{Ca}$
C
$\mathrm{P} < \mathrm{Cl} < \mathrm{Ca} < \mathrm{Mg}$
D
$\mathrm{Ca} < \mathrm{Mg} < \mathrm{P} < \mathrm{Cl}$

Did you get this right?

Solution

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NEET UG Inorganic Chemistry in other years

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NEET UG 2010 — Chemistry Inorganic Chemistry

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NEET UG 2010 — Chemistry Inorganic Chemistry

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Solution

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