What words do we use to talk about a column of the periodic table? (2 CORRECT ANSWERS) Period Group Family Atom Nucleus

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

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!

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