Question

OR
An element X with atomic number 11 forms a compound with
atomic number 11 forms a compound with element 'Y
with atomic number 8. The formula of the compoumd
The formula of the compound formed is
(​

Answer 1

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Here is your answer...

Element:- X Y

Valency:- 1 2

Formula of the compound formed

Is...

X↓2 Y

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Answer 2

The formula of the compound formed by an element X (of atomic number 11) and an element Y (of atomic number 8) is X2Y.

• The electronic configuration of element X is 1s2,2s2,2p6,3s1 ,so in order to attain nearest noble gas configuration it loses one electron and forms a monovalent cation X(+).
• The electronic configuration of element Y is 1s2,2s2,2p4 ,so in order to attain nearest noble gas configuration it gains two electrons to form a divalent anion Y(2-).
• Now, since a compound should be electrically neutral , its formula should be X2Y.