Question

How does valencey of an element very across a period ?

Answer 1

Answer:

The valency of an element depends the availability of an electrons (or electrons) in its valence shell i.e on its valence electrons. Across the period, first it increases from 0 to 4 and then starts decreasing from 4 to 1.

Answer 2

Answer:

Valency of element across a period first increases then decreases

EX: In period 3: valency of

Na=1

Mg=2

Al=3

Si=4

P=3

S=2

Cl=1

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