Question

Explain the meaning of the term Valency state why the valency of the metal potassium is positive 1 and and of the non metal chlorine is negative 1

Answer 1

valency means combining capacity of an atom or a group of atom to attain near most Noble configuration .

for this atom has to share electron or give or take electron.

in the case of potassium the atom loses electron to provide atom of other element to attain nearest Noble configuration.

for this reason potassium has positive one valency.

similarly chlorine gains one electron to attain a noble configuration .For this reason it has negative one valency.

Answer 2

Answer:

valency is the no. of hydrogen atoms which can combine with or displace one atom of the element or radical so as to form a compound.

Explanation:

valency of a metal is the no. of electrons lost per atom of the metal. so potassium gives one e- to attain the configuration of nearest noble gas.which gives it a valency of +1

valency of a non metal ia the no. of electrons gained per atom of the non metal. so chlorine takes(gains) one e- to attain the configuration of nearest noble gas.which gives it a valency of -1