EVERYDAY SCIENCE

Detailed explanation-1: -The first element in the periodic table is hydrogen. Its atomic number is 1 . It belongs to the first group and first period of the periodic table.

Detailed explanation-2: -Hydrogen is the first element of the periodic table as its atomic number is one, which means it has only one electron in its atom and thus only one electron is present in its outermost shell. The placement of elements in the periodic table is based on their electronic configuration.

Detailed explanation-3: -The ordinary isotope of hydrogen, H, is known as Protium, the other two isotopes are Deuterium (a proton and a neutron) and Tritium (a protron and two neutrons). Hydrogen is the only element whose isotopes have been given different names. Deuterium and Tritium are both used as fuel in nuclear fusion reactors.

Detailed explanation-4: -Why is hydrogen’s atomic number 1? The atomic number is equal to the number of protons in an atom’s nucleus. Hydrogen’s atomic number is 1 because all hydrogen atoms contain exactly one proton.