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

2H₂ + O₂ \(\longrightarrow \)2H₂O. This is a___________ reaction.

(a)

Combination

(b)

Displacement

(c)

Decompostion

(d)

Exothermic

_________ isotope is used in the nuclear reactors.

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Uranium-235

The number of neutrons present in \(_{ 3 }^{ 7 }{ Li }\) is ------

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  4 

The valency of Argon is ________

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   zero

Positive charges are concentrated in the central region of the atom called __________.

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Nucleus

Bohr model was applicable only to _________

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Hydrogen

In an atom, electrons revolve around the nucleus in fixed orbits

(a) True

(b) False

Isotopes of an element have different atomic numbers

(a) True

(b) False

Electrons have negligible mass and charge.

(a) True

(b) False

Beta particle is negatively charged and is identical with electron.

(a) True

(b) False

Orbit is the path by which electrons revolve around the nucleus. 

(a) True

(b) False

Dalton

(1)

First atomic theory

Thomson

(2)

\(\alpha \)-ray scattering experiment;

Isotopes

(3)

Plum pudding model

Rutherford

(4)

Same atomic number but different mass number;

Isobars

(5)

same mass number