Question

The horizontally arrangement is called​

Answer 1

Answer:

The horizontal arrangement of elements in the periodic table is called period. ... For example, in 3rd period, first member, Na has one valency electron and the last member.

Explanation:

Hope this is helpful...

If I am correct follow me and Mark me as a brain list

Answer 2

Answer:

The horizontal arrangement of elements in the periodic table is called period. ... For example, in 3rd period, first member, Na has one valency electron and the last member, Ar, has eight valency electrons..

pls follow me....