For an atom of a given element, the number of electrons equals to:
the atomic number of the element
the number of proton − number of neutrons
the number of protons + number of neutrons
the mass number of the element
A
the atomic number of the element
B
the mass number of the element
C
the number of protons + number of neutrons
D
the number of proton − number of neutrons
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Solution
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For an atom of a given element, the number of electrons are equal to the number of protons which is equal to atomic number of the element.
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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
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