Q.

An element X has atomic number 19. What will be the formula of its oxide ?

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a

X2O

b

XO

c

XO2

d

X2O3

answer is A.

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Detailed Solution

Element X has atomic number 19. Its valency is one. Hence the formula of its oxide will be X2O. Z = 19; 1s2 2s2 2p6 3s2 3p6 4s1.
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An element X has atomic number 19. What will be the formula of its oxide ?