Question

Select correct statement(s).

This question has multiple correct options
A

The noble gases are present to the extent of about 1% in the earth's atmosphere, the chief component being argon

B

Helium is the second most abundant element in the universe after hydrogen

C

There are two stable isotopes of helium

D

ise formed by thermonuclear fusion reaction in stars

Medium
Solution
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Correct options are A) , B) , C) and D)

The relative abundance in dry air by volume (ppm) of different noble gases is
  Mass decrease (amu) Energy released
  0.026 
  0.018 
  0.029 
Hydrogen is the most abundant element in the known Universe; helium is second.This was earlier rank process which was not followed after this as rank of oxygen is 3 but atomic no. of oxygen is 8.
Although there are nine known isotopes of helium (He) but only helium-3 (3He) and helium-4 (4He) are stable.

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