Name the element whose atomicity is
(a)Tetra atomic
(b)diatomic

a

Explanation:

because its measure it

Phosphorus is a tetra atomic element as it always exists as .

Names of Mono and Tetra atomic elements

Explanation:

The total number of atoms present in the molecule is called atomicity.

Based upon atomicity, the molecules are classified as mono atomic, diatomic, triatomic, and poly atomic molecules.

Mono atomic element:

The element which is made up of only one atom, they are called a mono atomic element.

The examples include Sodium, Zinc, Magnesium, Helium, Neon etc.

Tetra atomic element:

The elements which is made up of 4 atoms of same molecules, they are called a tetra atomic element.

Phosphorus is a tetra atomic element as it always exists as .

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Explanation:

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.