Q 01/05
A) 2
B) 1
C) 3
D) 8
Answer · why
Its symbol is H, and its most common isotope is nothing more than one proton and one electron.
Q 02/05
A) About 95%
B) About 25%
C) About 50%
D) About 75%
Answer · why
By number of atoms rather than mass it is even more dominant, above 90%.
Q 03/05
A) H
B) H3
C) H2
D) H4
Answer · why
The official name is dihydrogen; the gas is colourless, odourless, non-toxic and highly combustible.
Q 04/05
A) Robert Boyle
B) Antoine Lavoisier
C) Joseph Priestley
D) Henry Cavendish
Answer · why
He suspected the gas was the mythical phlogiston itself and is usually credited with discovering the element.
Q 05/05
A) Water-former
B) Sky-stuff
C) Light-bringer
D) Fire-air
Answer · why
It comes from the Greek hudor (water) and gennao (I bring forth), because burning it produces water.
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