1. __NaCI + __F2=__NaF + __CI2 2. __NaBr + __H3PO4=__HBr + __Na3PO4 3. __H2 + __O2= __H2O
4. __Ca + __H2O= __Ca(OH)2 + __H2
5. __H2 + __N2= __NH3
6. __Al2O3= __Al + __O2
7. __Ca + __F2= __CaF2

Use examples from the article to explain one positive and one negative effect that chemistry has had on society

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!