Q44 of 149 Page 211

The atomic numbers of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element which cannot form a cation is:

The element which cannot form a cation is C.

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42

Which of the following elements does not exhibit electrovalency?

 43

The number of valence electrons in a graphite atom is:

 45

The number of valence electrons in a sulphide ion, S2-, is:

 46

For an element, Z = 9. The valency of this element will be: