Question

Three elements "x", "y"amd "z" have atomic numbers 7, 8, and 9 respectively.
a) state their position (group number and period number both ) in modern periodic table.
b) arrange these elements in the decreasing order of their atomic radii.
c) write the formula of the compound formed and 'x' combines eith 'z' .

Answer 1

a) 7 is in group 15, 8 - group 16 and 9 is group 17
where all are in same period no. 2
b)x-y-z
c)nitrogen oxide
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