Five atoms are labelled V to Z
Atoms Mass number Atomic Number
V 40 20
W 19 9
X 7 3
Y 16 8
Z 14 7
Write down the formula of the compound formed by atoms X and Y.

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Solution

Element X has atomic number 3 and Element Y has atomic number 8.
Lithium(Li) has atomic number 3 and Oxygen(O) has atomic number 8.
Lithium oxide is a compound of Lithium having formula ${Li}_{2} O$ .

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