How many different elements are in the compound sodium carbonate \[(N{a_2}C{O_3})\]?

Hint: A mole is one of the fundamental units which helps to calculate a big number. In any chemical reaction, the number of mole ratio of reactant and product is always fixed i.e., we always use a fixed number of molecules of reactant to form a fixed number of moles of product.

Complete step by step answer:
A mole is derived from a Greek word called Mol which means a heap or a pile. It is used to calculate a big number which is difficult to calculate in real terms. In the international System of Units called SI system, mole is one of the fundamental units which help us to calculate the big numbers. It is also called Avogadro’s number in respect of Amadeo Avogadro and one mole of any substance (atom, ions, molecules, electron, neutron, and proton) is equal to
$1\;mole\; = 6.022 \times 1{0^{23}}$ particles
In chemistry, mole is widely used to calculate the amount of substance formed, volume of gas released at Standard temperature and pressure condition called STP, number of particles or molecules formed during a chemical reaction.
It also helps us to calculate the gram molecular mass and gram atomic mass of a substance in reference of $\dfrac{1}{1{2^{th}}}\;of\;C - 12.$
Given: A molecule of sodium carbonate $(N{a_2}C{O_3})$
Formula used: Let us consider one molecule of sodium carbonate, in which following atoms are present, one atom of carbon, \[2\] atom of sodium, \[3\] atom of oxygen
So, in the given one molecule of sodium carbonate, there are three types of atoms present.
Final answer:
In the given formula of sodium carbonate there are three types of atoms are present i.e., carbon, sodium and oxygen

Note: In nature various elements are present, some are either combined with other elements or they exist in native form. On the basis of their atomicity they are further classified into various parts like monoatomic, diatomic, triatomic and polyatomic.