why there is a gap between hydrogen and helium?
Answers
Answered by
2
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).
Attachments:
Answered by
1
Answer:
Because Hydrogen and Helium belong to different periodic 'groups'. The Hydrogen element belongs to the 'Hydrogen' group, whereas the Helium element belongs to the 'noble gas' group.
Similar questions