The basic unit of matter is ______.

(a)

Element

(b)

Atom

(c)

Molecule

(d)

Electron

_______ is positively charged.

(a)

Proton

(b)

Electron

(c)

Molecule

(d)

Neutron

The average diameter of an atom is ____________

(a)

10^-8 m

(b)

1 m

(c)

1 A^o

(d)

10^-5 m

Whose theory does not propose anything about the positive and negative charges of an atoms.

(a)

J.J. Thomson

(b)

Dalton

(c)

Rutherford

(d)

Bohr

____________ is the smallest unit used to measure small lengths

(a)

Metre

(b)

Nanometre

(c)

Millimetre

(d)

Centimetre

The _______ revolve around the nucleus.

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electrons

If the valency of carbon is 4 and that of hydrogen is 1, then the molecular formula of methane is_______.

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CH₄

____________ is the smallest particle of a chemical element.

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Atom

The __________ are combination of atoms of various elements or the same element.

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molecules

According to John Dalton, atom is a hard, solid, ball and it is ______________

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indivisible

A neutron is a neutral particle

(a) True

(b) False

J.J. Thomson proposed than an atom consists of positively charged sphere in which the electrons are embedded

(a) True

(b) False

The outermost orbit of an atom can have more than 8 electrons.

(a) True

(b) False

Most of the space in an atom is occupied by electrons

(a) True

(b) False

Rutherford used beta particles in his scattering experiments

(a) True

(b) False

Valency

(1)

Electrons in the outermost Orbit

Neutral Particle

(2)

Monovalent

Iron

(3)

Fe

Hydrogen

(4)

Proton

Positively charged Particle

(5)

Neutron