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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.
(a) The number of protons in the nucleus of an atom is called its atomic number.
(b) The total number of protons and neutrons in the nucleus of an atom is called its mass number.
(c) In general, an atom has an atomic mass number 23 atomic number 11. The atom has 11 electrons.
(d) An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of an atom is 23.
(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 20.
(f) All the mass of an atom is concentrated in a small region called the nucleus.
(g) Cathode rays are a beam of fast-moving electrons.
(h) The anode rays obtained from hydrogen gas consist of protons.
(i) The maximum number of electrons that can be accommodated in the L shell are 8.
(j) The maximum number of electrons that can be accommodated in the M shell is 18.
(k) The subatomic particle not present in a hydrogen atom is a neutron.
(l) An electron has a negative charge, a proton has a positive charge, and a neutron has no charge.
Updated on: 10-Oct-2022
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