Among the following the odd pair is

(a)

₈O¹⁸,9F¹⁹

(b)

₁₈Ar⁴⁰,₇N¹⁴

(c)

₁₄Si³⁰, _15P³¹

(d)

₂₄Cr⁵⁴, ₁₉K³⁹

The term nucleons refer to

(a)

Protons and electrons

(b)

only Neutrons

(c)

electrons and neutrons

(d)

Protons and neutrons

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

Law of multiple proportions was proposed by _________

(a)

J. Ritcher

(b)

Rutherford

(c)

John Dalton

(d)

J.J Thomson

The compounds N₂O, NO₂, N₂O₄, N₂O₅ explains___________ law.

(a)

Law of definite proportion

(b)

Law of multiple proportion

(c)

Law of reciprocal proportion

(d)

Law of conservation of mass

Most of the fast moving \(\alpha \)  particles passed straight through the gold foil explains __________

(a)

An atom has nucleus

(b)

There is a large empty space around the nucleus.

(c)

Electrons move in circular paths

(d)

Nucleus is in the centre

Maximum number of electrons that can be accommodated in an energy level is given by the formula ___________

(a)

n²

(b)

2n²

(c)

3n²

(d)

2n³

Protons and neutrons are collectively called as ________

(a)

mesons

(b)

neutrino

(c)

Nucleons

(d)

Positrons

The outermost shell of an atom is called its________ shell.

(a)

inner

(b)

outer

(c)

valence

(d)

sub shell

Elements which have valence electrons 1 or 2 or 3 are ____________

(a)

metal

(b)

non-metal

(c)

rare metal

(d)

valuable metal