Question

Which of the following statements are true
A.Among all the naturally occurring elements , around eighty percent are metals
B.Non-metals are more abundant than metals
C.Sodium and potassium are soft like wax.
D.Bromine is reddish brown at room temperature

Answer 1

Hint: Periodic table is a tabular display of all the elements which are placed according to the atomic number. The metals are placed at the left side and non-metals are placed at the left of the periodic table.

Complete step by step answer:
1.There are \[118\] elements which we so far know, out of which around $92$ are naturally occurring. Mostly are metals in $92$ elements. So this statement is true that among all the naturally occurring elements, around eighty percent are metals.
2.Now for statement two, it is wrong because in the case of periodic table metals are more abundant than non-metals.
3.Sodium and potassium are group one elements. Sodium and potassium both are alkali metals. The hardness of metals are identified by the cohesive forces between them. In case of sodium and potassium the cohesive force between them is very weak. Due to this reason, these two elements are very soft just like wax.
4.Bromine have atomic number $35$, at room temperature bromine is liquid which is reddish brown in colour. It also easily evaporates and forms fumes which also have similar colour.
So, from the above discussion the statements $1$,$3$ and $4$ are true.

Note:
Bromine is corrosive in nature , it may affect human tissue when it is in liquid state . Bromine vapours are also very toxic if they are inhaled . sodium is an essential electrolyte for our body which balances the level of water in and around the cell . It also maintains the stable blood pressure level in our body .