Question

Hydrogen is the first element in the modern periodic table. This is because
1) it is the lightest element
2) It is a gas
3) It is the most abundant element in the universe
4) Its atomic number is one
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Answer 1

Answer:

3 is your ans of your interesting questions

Answer 2

Hydrogen is the first element withinside the modern periodic table. This is because its atomic number is one  :

Explanation:

• Hydrogen is described because the first element of the periodic table due to the fact its atomic range is 1, this means that it contains only one single electron in its atom.
• Therefore only 1 electron is to be had in its outermost shell.
• The element placement withinside the periodic table is according to their electronic configuration

Answer -Option (4)  its atomic number is one.