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Atomicity

why we consid...

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why we consider number of hydrogen,double of no. of atom of oxygen and number of chlorine for valency

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Q. How can we obtain valency if we know the atomic no. For example the atomic number of oxygen is 2,6(8) then what is the valancy?

Q. Valency can be defined as the same number of hydrogen atoms or double the number of oxygen atoms that element combines with.

Q. The relative molecular masses of hydrogen, nitrogen, oxygen and chlorine are double their relative atomic masses.

Q.
In the given electron dot structure of molecule ABC, the atomic number of A and C is 1 (consider both of them as hydrogen atom). The no. of valence elctrons in B are _____.

Q. In which group do all the elements have a valency of one?
(a) hydrogen, oxygen, chlorine
(b) potassium, hydrogen, sulphur
(c) sodium, chlorine, hydrogen
(d) sodium, hydrogen, sulphur

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