Answer:
Option D is good to go!
Explanation: as per the reactivity series more reactive substances will react with the counterpart substance.The most reactive substance here is calcium while the least reactive is aluminium, the magnesium comes in between.As per their reactivity, these substances will react with oxygen.
Explanation:
Answer:
It is not a gas because its particles do not have large space between them.
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Answer:
The atomic mass number is the number of protons and neutrons in an atom.