Question

How do we find the valency? Give a example.(Most helpful will be brainliest.)

Answer 1

Answer:FELLING NICE TO HELP YOU

Explanation: The valency of an element is the number of hydrogen atoms that can combine with or replace (either directly or indirectly) one atom of the element. In other words, the valency of an element is the number of electrons an atom of the element uses to combine with atoms of other elements - it is the combining power of an atom of the element. In an atom, the valence electrons are the electrons that can be used in combining with other atoms - these are the electrons in the orbitals of the outermost shell (also called valence shell).

Notice that it is not in all cases that the valency of an atom equals the total number of its valence electrons. For example, oxygen has six valence electrons, but its valency is 2. Some elements may have more than one combining power (or valency), while others have just one.

For example, H →1; Mg→2; Al→3; C→4; N→3, and 5; P→3 and 5; O→2; S→ 2, 4 and 6; Cl→ 1; and Ne→0.

The valencies of radicals are same as the number of charge they carry.

For example, NH4+ →1; OH- → 1 ; and SO42- → 2.❤️❤️❤️❤️

Answer 2

Method to find Valency:

⇒Valency is defined as the combining capacity of an atom or a molecule.

⇒ There are different ways to determine the valency of a given atom and they are:

• Octet rule: According to the octet rule, a compound is said to be stable when the outermost shell of the compound is having eight electrons. If the number of electrons in the outer shell is between one to four, the compound is said to have positive valency. 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. Metals in column 1 have a valency of +1 while the noble gases in column 18 have a valency of 0 and are inert.

• Valency from the chemical formula: This rule is based on the octet rule and by observing the combining of an element, the valency can be determined.

Therefore, these are the ways or methods that are used for calculating the valency.