24. An element X' belong to 3rd period and group 13 of the Modern Periodic Table.
a) Determine the number of valence electrons and the valences of 'X'.
b) What is the molecular formula of the compound formed when 'X' reacts with an
element Y'? atomic number =18
c) Write the name and formula of the compound formed when 'X' combines with
chlorine
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(a) Since it belongs to group 13, therefore no. of valence electrons-3
The Valency of element X is 3
(b) Valency of Y = 2,8,8
The Molecular formula of compound formed is XY3
(c)When X combines with chlorine the compound formed : XCl3
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