Q36 of 203 Page 152

An element which can exhibit valencies of 2, 4 and 6 can be:

Sulphur has 2 valence electrons in its outermost shells. Hence it exhibits valencies of 2, 4 and 6.

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The anion of an element has:

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A particle X has 17 protons, 18 neutrons and 18 electrons. This particle is most likely to be:

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The atomic number of an element E is 16. The number of electrons in ion E2- will be:

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The cation of an element has: