(a) Since the atomic number given = 13
The Electronic configuration of the element= 2, 8, 3
(b) Group number to which the element ‘X’ belongs = 10 +3 = 13th group.
(c)Since ‘X’ has 3 valence electrons. So, ‘x’ is a metal.
(d) The formula for the bromide can be calculate by cross multiplication of the valences which is as follows:
So, formula of its bromide is XBr3
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