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Three elements 'X', 'Y' and 'Z' have ato...

Three elements 'X', 'Y' and 'Z' have atomic numbers 7, 8 and 9 respectively.
(a) State their positions (Group number and period number both) in the Modern Periodic Table.
(b) Arrange these elements in the decreasing order of their atomic radii.
(c) Write the formula of the compound formed when 'X' combines with 'Z'.

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(a) All these elements are present in second period. Their group numbers are : X (15), Y (16), Z (17).
(b) The decreasing order of atomic radii : `X gt Y lt Z.`
(c) The formula of the compound : `XZ_(3).`
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