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Standard IX

Chemistry

Structure of Atom

The part of a...

Question

The part of an atom where nearly the entire mass of an atom is concentrated is:

Electron

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Nucleus

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Neutron

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Quark

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Solution

The correct option is B
Nucleus

The part of an atom where the entire mass of atom is concentrated is called nucleus

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Similar questions

What did Rutherford conclude regarding the atomic mass?
(i) Mass of the atom is uniformly distributed.
(ii) Nucleus of an atom is much heavier than electron.
(iii) Nearly all the mass of an atom resides at the centre of an atom.
(iv) Nucleus of an atom is lighter than the electron.

Q. Assertion :In the Rutherford experiment, most of the

α

particles passed without any deviation through the gold foil. Reason: The entire positive charge and nearly all of the mass of an atom is concentrated in the centre of the atom known as nucleus.

Q. An atom of an element contains

13

electrons. Its nucleus has

14

neutrons. Find out its atomic number and approximate atomic mass. An isotope has atomic mass

2

units higher. What will be the number of protons, neutrons and electrons in the isotope?

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.

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The part of an atom where nearly the entire mass of an atom is concentrated is:

The correct option is B Nucleus The part of an atom where the entire mass of atom is concentrated is called nucleus

The correct option is B
Nucleus

The part of an atom where the entire mass of atom is concentrated is called nucleus