colour and constitution.., Chemistry

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The nucleus of an element contains 9 protons. Its valency would be : (1) 1        (2) 3        (3) 2        (4) 5 Ans: 1

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The charge on the atom containing 17 protons, 18 neutrons and 18 electrons is: (1) +1                    (2) -2      (3) -1                     (4)Zero Ans: -1

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