Question

Which of the following sets of elements follows Newland's octave rule?

• A. Be, Mg, Ca
• B. Na, K, Rb
• C. F, Cl, Br
• D. B, Al, Ga

Answer 1

The correct option is A

Be, Mg, Ca

Explanation for the correct options:

(A) $\mathrm{Be},\mathrm{Mg},\mathrm{Ca}$

• Newland's octave rule is valid for 56 elements in the periodic table, up to $\mathrm{Ca}$.
• It is based on increasing atomic mass.
• According to this rule, every eighth element should possess properties similar to that of the first element.
• $\mathrm{Be},\mathrm{Mg},\mathrm{Ca}$ follow Newland's octave rule.

Explanation for the incorrect options:

(B) $\mathrm{Na},\mathrm{K},\mathrm{Rb}$

• $\mathrm{Rb}$ is not considered under Newland's octave rule.

(C) $\mathrm{F},\mathrm{Cl},\mathrm{Br}$

• $\mathrm{Br}$is not considered under Newland's octave rule.

(D) $\mathrm{B},\mathrm{Al},\mathrm{Ga}$

• $\mathrm{Ga}$ is not considered under Newland's octave rule.

Hence, option (A) is correct., $\mathrm{Be},\mathrm{Mg},\mathrm{Ca}$ follows Newland's octave rule.