1) What is oxygen? a) b) c) d) e) 2) who is the author of the periodic table a) nobody b) chemist Dmitri Mendeleev c) Anna Ivanova Popova d) scientists discover it 3) what is hydrogen? a) Hydrogen is the chemical element with atomic number 1, represented by the symbol H. b) Is a irrelevant element  c) It’s a solid element that atomic number is H 4) what element is gas? a) Hydrogen b) Carbon c) Sulphur d) Aluminum 5) What of this elements are “Synthetic element” a) Plutonium b) Mercury c) Chlorine d) Calcium 6) What is heterogeneous? a) is a mixture in which the composition is not uniform throughout the mixture. b) is a mixture in which the composition is uniform throughout the mixture c) It’s only a mixture that’s it d) None is correct 7) (HARD) what is the atomic number of oxygen? a) 17 b) 9 c) 8 d) 7 e) 11 f) 15 8) what is nitrogen? a) b) c) d) 9) What of this elements are liquid? a) Bromine b) Calcium c) Krypton d) Silicon  10) What of this elements are is an non-metal a) Magnesium b) Phosphorus c) Arsenic d) None 

Periodic table

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