If a iron bar cost $0.015cm^3 and it's 8.0cm wide and 0.40cm high and 310 cm long how much will it cost to make the iron bar

1) this is the structure in the cell nucleus that houses a cell's genetic information

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!

Using the periodic table, complete the following. element: hydrogen symbol: h₂ molecular weight: g mass of one mole: g/mol