Chemistry, asked by shilpakattani, 10 months ago

write the valency of all compound and identify the valency of each element
Nacl
mgso4
cao
Fecl3
cu2o2​

Answers

Answered by ksatish7166
0

Answer:

Valency

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.

Group number

12345678

Valency

12343210

The noble gases have the valency 0 as they do not usually combine with other elements.

To write the chemical formula for a compound it is best to use the S.V.S.D.F system.

S - write down the symbols of both the elements involved.

V - beneath each symbol, write it’s valency. Memorising the above table is useful.

S - swap the valencies over.

D - if the valencies can be simplified, divide them both by the smaller of the two numbers. If one of the numbers is already one, then they cannot be divided and simplified any further.

F - write the formula.

Example

What is the formula for potassium oxide?

Potassium has a valency of one. Oxygen has a valency of two. The formula is K2O.

Question

What is the formula for aluminium oxide?

Reveal answer

Question

What is the formula for carbon sulfide?

Reveal answer

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