what is valency why is it important to study the electronic configuration of an element
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Answer:
The less valence electrons an atom holds, the less stable it is. Electron configurations tell us how many valence electrons are in an element and therefore give us an idea of the element's bonding ability, magnetism, and other chemical properties.
the valency of an atom is the number of electrons it can share or recieve
for eg, take oxygen, O has 6 electrons in the outer most shell, so if it gets 2 more electrons, it has attained octet. every element tries to attain octet (O2-)
we need to know the electronic config of an element to know its reactivity, how it'll react, what it'll give after a reaction, magnetic property, and many other things, even its valancy.
knowing the valency helps us to know the formula of a compound as well like
O2- + Mg2+ ----> MgO