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The nucleus of helium contains:
(1)Four protons
(2)Four neutrons
(3)Two neutrons and two protons
(4)Four protons and two electrons
Ans: (3)Two neutrons and two protons
There is more number of substances in the universe than 109 elements. Most matter we run into on a day-to-day basis is composed of compounds-substances in which two or more element
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