Answer:
option 2 is correct answer. its nitrogen.
I think it means the reaction doesn't have any intermediate phases - the order doesn't change, and it moves at the same rate, it doesn't speed up or slow down at any time
Answer:
The answer for the frist one is C is a chemical property and D is a physical property. The sconed one this implies both the atoms have the same nucleus but different charges so it can be concluded that they are both the atoms of the same element but one of them is electrically neutral and the other has stable electronic configuration.
Explanation:
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~Zero~
Helium was first discovered in space before it was on earth