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Standard VIII

Chemistry

Variation of Atomic Size

In an atom, t...

Question

In an atom, the nucleus is at the centre constituting protons and neutrons. Electrons are around the nucleus occupying specified shells. What does atomic size (or radius) refer to?

Distance from the first orbit to the outermost orbit.

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Distance from the centre of the nucleus to the valence orbit.

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Total number of shells.

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Distance from the border of the nucleus to the outermost orbit.

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Solution

The correct option is B Distance from the centre of the nucleus to the valence orbit.
Atomic size refers to the radius of an atom. The atomic size may be visualized as the distance between the centre of the nucleus and the valence shell of an isolated atom.

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Similar questions

Q. In an atom, electrons are arranged around the nucleus in various shells. What do ‘valence electrons’ refer to?

Select the sub-atomic particles that are present in the nucleus of an atom.

A. Electrons

B. Protons

C. Neutrons

Name the following :

(a) The element which does not contain any neutron m its nucleus.

(b) An element having valency 'zero'.

(d) Two atoms having the same number of protons and electrons but different number of neutrons.

(e) The shell closest to the nucleus of an atom.

Fill in the blanks in the following statements :

(a) The number of protons in the nucleus of an atom is called its ....................

(b) The total number of protons and neutrons in the nucleus of an atom is called its ....................

(d) An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of the atom is ....................

(e) If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is ....................

(f) Almost all the mass of an atom is concentrated in a small region of space called the ....................

(g) Cathode rays are a beam of fast moving ....................

(h) The anode rays obtained from hydrogen gas consist of particles called ....................

(i) The maximum number of electrons that can be accommodated in L shell are ....................

(j) The maximum number of electrons that can go into the M shell is ....................

(k) The subatomic particle not present in a hydrogen atom is ....................

(l) The electron has .................... charge, the proton has .................... charge, and the neutron has .................... charge.

An atom consists of protons surrounding a nucleus that contains electrons and neutrons.

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In an atom, the nucleus is at the centre constituting protons and neutrons. Electrons are around the nucleus occupying specified shells. What does atomic size (or radius) refer to?

The correct option is B Distance from the centre of the nucleus to the valence orbit.Atomic size refers to the radius of an atom. The atomic size may be visualized as the distance between the centre of the nucleus and the valence shell of an isolated atom.

The correct option is B Distance from the centre of the nucleus to the valence orbit.
Atomic size refers to the radius of an atom. The atomic size may be visualized as the distance between the centre of the nucleus and the valence shell of an isolated atom.