Question

What elements are present in $N{a_2}{(OH)_4}$?

Answer 1

Hint : As we know that in periodic table, all the elements are present in a tabular form with their symbols and in this we are asked the elements present in the complex for that we need to know the symbols of the elements.

Complete Step By Step Answer:
Chemistry, as we all know, is a branch of science which involves the properties (physical and chemical) of the substance, their constituents and their applications. To make the study of chemistry easier, each and every element is given a symbol and these elements in their symbolic forms are present in a tabular form which is known as periodic table, which is made on the basis of their increasing atomic number. Mostly, all the element’s name is derived from a language called English.
For example: Symbol$(A)$is derived from Hydrogen which is its English name only
Compounds are simply the combination of two or more elements, so, in the compound $N{a_2}{(OH)_4}$, there are three elements present in it. $Na$is a symbol for Sodium element with atomic number$(Z)$$11$ and atomic weight$(A)$ of $23u$. This element is present in group$ - I$, and elements present in the first group are known as alkali metals. Its electronic configuration is $[Ne]3{s^1}$.
$O$is a symbol for an Oxygen element with atomic number$(Z)$ $8$ and atomic weight$(A)$ of $16u$. This element is present in group $16$, and elements in this group is known as chalcogens. Its electronic configuration is $[He]2{s^2}2{p^4}$.
$H$is a symbol for Hydrogen element with atomic number$(Z)$ $1$ and atomic weight$(A)$ of $1u$. This element is present in group $ - I$. Its electronic configuration is $1{s^1}$.
Sodium and Hydrogen, both of these elements are present in s-block and Oxygen element is in p-block.
So, in the compound, $N{a_2}{(OH)_4}$, three elements are present, two atoms of Sodium, four atoms of Hydrogen and four atoms of Oxygen.

Note :
Here, we were given molecular formula, which tells us about the atoms present in the compound and how many atoms are there in it. It consists of elements with their symbols. We can understand a lot about the compound for its molecular formula.