Which compound is most likely a powerful and dangerous acid?

a. h2s
b. hbr
c. li2o
d. libr

i need it now if you can get it : )

If the element whose electric configuration ends in the d sublevel, the element is calssified as? a. inner transition b. noble gases c. representative d. transition

What produces wave a)sound b) heats c)transfer of energy d)vibrations

How many moles are in 43.9 l of oxygen