Question

guys you have answered but i want like this

oxygen = o2

i dont understand who is of which

here is my question i have asked to you

short form of these following gases

eg oxygen = o2

1 nitrogen
2 helium
3 ammonia
4 hydrogen

etc if you know

please ans me its a request

please dont ans like
nitrogen = n

please not like this
ans me please​​

Answer 1

Answer:

I don't know

Answer 2

Answer:

1 n2

2 he1

3 Nh6

4 hg6

please mark me as brainlist