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In the nucleus of20 Ca40 there are:
(1) 40 protons and 20 electrons
(2) 20 protons and 40 electrons
(3) 20 protons and 20 neutrons
(4) 20 protons and 40 neutrons
Ans: 20 protons and 20 neutrons
i need 10 mcqs and 1 structural question
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