CHEMISTRY QUIZ

1.what is the first element on periodic table?
Hydrogen
Helium
Hygdrogen
Humidity
2.which is noble gas element
calcium
potassium
carbon
helium
3.Chemistry is a study of matters only.
Yes
No
4.calcium has 20 atomic mass
Yes
No
5.which chemical formula of water
HO2
O2H
H2O
2HO
0
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