What percentage of the matter in the universe consists of hydrogen?
50%
20%
90%
74%
About 75% of the matter in the universe is hydrogen and the remaining quarter is helium. All the other elements are relatively rare to find.
What % of matter in universe consists of hydrogen?
The percentage of empty space in a body centred cubic arrangement is ...............
(a) 74 (b) 68 (c) 32 (d) 26