Based on the group valency of elements state the formula for the following giving justification for each:; (i) Oxides of 1st group elements,; (ii) Halides of the elements of group 13, and; (iii) Compounds formed when an element of group 2 combines with an element of group 16.(Delhi - 2014)
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yes yes yes because oxides in group this are s block element and halides are p group element
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I) M - 1st group element
O - oxygen
The valency of first group elements +1 whereas the valency of oxygen is -2 .
Thus the formula of oxides is M2 O.
II) M - 13th group element
X - halogen
The valency of group 13 elements is +3 and the valency of halogen is -1.
Thus the formula of the halides formed is MX3.
III) M - group 2 element
Y - group 16 element
The valency of the group 2 elements is +2 and the valency of group 16 elements is -2 .
Thus the formula of the compounds formed is MY.
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