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Question
Elements \[\ce{X, Y}\] and \[\ce{Z}\] have 4, 5 and 7 valence electrons respectively. Write the molecular formula of the compounds formed by these elements individually with hydrogen.
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Solution
To the electronic configuration, a total of 8 electrons must be present in the valence shell of an element. Element \[\ce{X}\] has 4 valence electrons, so it will share the remaining 4 electrons for the formation of the bond, the molecular formula will be \[\ce{XH4}\]. The element \[\ce{Y}\] has 5 valence shell electrons, so it will form 3 bonds and the formula will be \[\ce{YH3}\]. The element \[\ce{Z}\] has 7 valence shell electrons, so it will form one bond with hydrogen and has the molecular formula \[\ce{H - Z}\].
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