Select the correct statements below. I. An atom of chlorine is larger than sulfu

Question

Select the correct statements below.

I.          An atom of chlorine is larger than sulfur because the addition of an electron increases the repulsions without an increase in attraction for the nucleus resulting in less screening.

II.        An atom of oxygen is smaller than an atom of carbon because the distance of the valence electrons remains the same while the attraction for the nucleus increases with increasing number of protons.

III.       An atom of potassium is smaller than an atom of rubidium because both effective nuclear charge increases down a group and the principal quantum number of the valence orbitals increases

IV.       An atom of sodium is smaller than an atom of magnesium because both effective nuclear charge increases down a group and the principal quantum number of the valence orbitals increases

V.        An atom of chlorine is smaller than an atom of bromine because the principal quantum number of the valence orbitals increases.

VI.       An atom of silicon is smaller than an atom of carbon because the principal quantum number of the valence orbitals increases.

            a)         II, IV, V only

            b)         II, V only

            c)         I, III, VI only

            d)         I, III, IV, VI only

            e)         Only II

Explanation / Answer

I) Wrong. Chlorine is smaller than sulfur because its effective nuclear charge is larger.

II) Right.

III) Wrong.

IV) Wrong. Sodium and Magnesium belongs to the same period.

V) Right.

VI) Wrong.

Correct ans - (b)

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