Which of the following is a metal? a.
silicon, Si, Z = 14

b.
phosphorus, P, Z = 15

c.
thallium, Tl, Z = 81

d.
arsenic, Z = 33

e.
nitrogen, N, Z = 7

Matches the chemical name of each oxide of phosphorus to its chemical formula

What approach is required to balance the objectives of sustainable development? balancing the objectives of sustainable development requires a(n) .

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!