21.
21. The atomic number of two elements X and Y are 20 and 35 respectively. What type of
bonding is expected when they combine chemically? Give the formula and the
electron dot structure of the compound formed.
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These two valence electrons are accepted by two Y atoms (valency 1). Hence, the molecular formula of the compound formed between X and Y is XY2 . Ionic bond is formed between the elements X and Y in compound XY2.
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