In the nucleus of 20 ca 40 there are, Physics

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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


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