Arrange these species into isoelectronic groups. It does not matter which group goes in which box, so long as the correct species are grouped? He, Li+, Al3+, Y3+, N3-, O2-, Br-, Be2+, Sr2+

Pinene is an unsaturated hydrocarbon found in pine resin. if pinene has m+ = 136 and contains 1 double bond(s) and 2 ring(s); what is its molecular formula? enter the formula in the form ch first, then all other atoms in alphabetical order; do not use subscripts. the formula is case-sensitive