What is the positive charge on the nucleus of an atom due to?

Academic Chemistry NCERT Class 9

The positive charge in the nucleus of an atom is due to the presence of protons.

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Updated on: 10-Oct-2022

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(a) What is the nucleus of an atom and what is the nature of charge on it?(b) Name the scientist who discovered the nucleus of atom.
On the basis of Rutherford’s model of an atom, which sub-atomic particle is present in the nucleus of an atom?
If the number of electrons in an atom is 8 and number of protons is also 8, then(i) What is the atomic number of the atom? and(ii) What is the charge on the atom?
In the α-scattering experiment, few α-particles rebounded because(a) Most of the space in the atom is occupied.(b) Positive charge of the atom occupies very little space.(c) The mass of the atom is concentrated in the centre.(d) all positive charge and mass of the atom is concentrated in small volume.
Give the evidence for the existence of nucleus in an atom.
The ratio of the radii of hydrogen atom and its nucleus is ~ 105. Assuming the atom and the nucleus to be spherical,(i) What will be the ratio of their sizes?
What important information is furnished about the nucleus of an atom by the alpha particle scattering experiment of Rutherford?
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 ....................(c) An atom has atomic mass number 23 and atomic number 11. The atom has .................... electrons.(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.
Name the particles used by Rutherford in his experiment on the discovery of nucleus. Also state the charge on these particles.
What is the absolute mass and charge of an electron?
On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole.
When we rub glass rod with fur, the glass rod will acquire(A) Positive charge(B) Negative charge(C) Either positive or negative charge(D) Neither positive nor negative charge
What is the unit of electric charge?
The particle not present in an ordinary hydrogen atom is :(a) proton (b) neutron (c) nucleus (d) electron
Fill in the following blanks with suitable words :(a) The particle which is formed by gain of electrons by an atom is called ...................(b) The particle which is formed by the loss of electrons by an atom is called ...................(c) The particle which is formed by the loss or gain of electrons by an atom is called .....................(d) A potassium ion has positive charge because it contains less .................... than ...................(e) A sulphide ion has negative charge because it contains less ....................... than ...................

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