Question

what is valency? how the valency calculated ​

Answer 1

Answer:

For compounds with electrons four, five, six, or seven, the valency is determined by subtracting the electron from eight. All noble gases except for Helium have eight electrons. Periodic table: Periodic table consists of elements that are arranged in such a way that, the valency of a given element can be determined.

Answer 2

Valency is the ability of an atom to gain or lose electron in order to achieve the noble gas configuration.

• It refers to the ability of an element to combine with other element.

We can find the valency of an element through its atomic number and its electronic configuration.

• . Whereas in Fluorine with atomic number 9, the configuration stands out to be 2,7 and it has 7 electrons in its valence shell and needs to gain 1 more electron to achieve noble gas configuration and hence its valency is 1.