Question

What is the atomic number for hydrogen?

Answer 1

Hint: Hydrogen is the chemical element which is represented by the symbol H. It is the lightest element in the periodic table and present at the first position of periodic table and known as the most abundant chemical substance in the world.

Complete answer:
Atomic number of any substance is always a whole number as it is obtained by counting electron, proton and neutron in an atom. Whereas an atom is consist of a nucleus in which protons and neutrons are present where protons are positively charged species while neutrons are of neutral nature and same number electrons as that of protons are revolving around the nucleus and the overall charge on the nucleus in neutral.
Modern periodic table is arranged in such a manner that molecules are arranged according to their increasing atomic number and hydrogen is present at the first position of periodic table which suggests that atomic number of hydrogen is one.
Atomic number is defined as the number of protons present in the nucleus and it is generally represented by the symbol Z. Atoms of particular elements have the same atomic number as they consist of the same number of protons.
Number of protons present in hydrogen is one therefore we can say that the atomic number of hydrogen is one.

Note:
Atoms of different elements have different atomic numbers. Each element has its particular atomic number from which it gets recognized no two elements have the same atomic number like oxygen have atomic number 8 while hydrogen have one.