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Question

# Element Y accepts 3 electrons from element X to form a molecule. Guess the element Y and X from the options given below.

A
Y = Oxygen and X = Magnesium
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B
Y = Oxygen and X = Sodium
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C
Y = Carbon and X = Magnesium
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D
Y = Nitrogen and X = Aluminium
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Solution

## The correct option is D Y = Nitrogen and X = Aluminium- Atoms gain, lose or share electrons from their valence shell to complete their octet. This determines the valency of atoms. - An atom with more than four valence electrons tend to gain electrons to complete its octet. - An atom with less than four valence electrons tend to lose electrons to complete its octet. ElementAtomic no.Electronic configurationOxygen 82, 6Magnesium122, 8, 2Nitrogen72, 5Aluminium132, 8, 3Sodium112, 8, 1 Carbon62, 4 As element Y accepts three electrons, it should have five valence electrons, so that it can complete its octet by gaining three. Hence, element Y is nitrogen. Similarly, element X is aluminium as it has three valence electrons and by donating these, it attains nearest noble gas configuration (complete octet).

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