Why there is a gap between hydrogen and helium?

1.	Why there is a gap between hydrogen and helium?
Answer» ANSWER: Hydrogen has one proton, HELIUM has two. You can't have half of a proton. ... There is a gap between hydrogen and helium not because there may be some undiscovered elements, but because hydrogen is first element it is PLACED in group 1 and helium is placed in group 18 because of its chemical properties (NOBLE gas).

Answer»

Hydrogen has one proton, HELIUM has two. You can't have half of a proton. ... There is a gap between hydrogen and helium not because there may be some undiscovered elements, but because hydrogen is first element it is PLACED in group 1 and helium is placed in group 18 because of its chemical properties (NOBLE gas).

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Why there is a gap between hydrogen and helium?​

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Why there is a gap between hydrogen and helium?