Table describes the properties of four compounds. (table attached) compounds are most likely ionic?

compounds A and B
compounds b and c
compounds c and d
compounds d and a​

What are four significant sources of ghgs that come from wostem washington?

The reactions of photosynthesis occur in the of plant cell? a. mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll

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!