Among the following the odd pair is

(a)

₈O¹⁸,9F¹⁹

(b)

₁₈Ar⁴⁰,₇N¹⁴

(c)

₁₄Si³⁰, _15P³¹

(d)

₂₄Cr⁵⁴, ₁₉K³⁹

Change in the number of neutrons in an atom changes it to

(a)

an ion

(b)

an isotope

(c)

an isobar

(d)

another element

The term nucleons refer to

(a)

Protons and electrons

(b)

only Neutrons

(c)

electrons and neutrons

(d)

Protons and neutrons

The number of protons, neutrons and electrons present respectively in \(_{ 35 }^{ 80 }{ Br }\)

(a)

80, 80, 35

(b)

35, 55, 80

(c)

35, 35, 80

(d)

35, 45, 35

The correct electronic configuration of potassium is

(a)

2,8,9

(b)

2,8,1

(c)

2,8,8,1

(d)

2,8,8,3