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The atomic number of elements X,Y …

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The atomic number of elements X,Y and Z are (A-2),A and (A+2), respectively. Y is a noble gas (not helium) then 1)predict the valence electrons of X, Y and Z 2)predict the formula of a molecule formed from X and Z

Posted by Sudipta Roy Talukder 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 4 years, 3 months ago

As y is a nobles gas the group of y is 18th group or zero group
X=A-2, group of X is 16th group or VI A
Z=A+23,group of Y is 2nd group or IIA
(b) X→→ valency =2 (electronegative)
Z →→ valency =2 (elctropositive)
Hence the formula is ZX

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