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NCERT Exemplar Solutions Class 9 Science Solutions for Structure of the Atom - Exercise in Chapter 4 - Structure of the Atom
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Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)
Answer:
Answer is (d) (ii) and (iv)
Explanation:
Atomic number Z is the number of protons present in an electron which is also equal to a number of the electron in an atom. Since the mass of a neutron is negligible, a number of protons and electron is added to obtain a mass number of an element.
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