Most of the mass of an atom is concentrated in a small region of space called the ..............

nucleus

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neutron

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proton

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electron

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Solution

The correct option is A nucleus
Atom is made of particles called electrons, neutrons, and protons. Electrons have negligible mass and hence do not contribute much to the mass of an atom. Protons and neutrons contribute to the mass of an atom and are present in a small region called the nucleus. Hence option A is correct.

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Similar questions

Q. Almost all the mass of an atom is concentrated in a small region of space called the _________.

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.

During Rutherford's α-particle scattering experiment, he concluded that:

(i) electrons have a negative charge.
(ii) the mass and positive charge of the atom is concentrated in the nucleus.
(iii) neutron exists in the nucleus.
(iv) most of the space in an atom is empty.

Q. The three dimensional region in space occupied by an electron is called :

Q. Nucleus occupies most of the space in an atom.

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