If both compounds have carbon (C) and hydrogen (H), why they are not the same substance? Substances are determined by
their temperature
their purpose
the ratios of different atoms in them
the number of hydrogen atoms in them
.

Which element would mostly likely have an electron affinity measuring closest to zero

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!

Once similarity and one difference between a mixture of elements and a mixture of compounds