Which of the following gases was most likely present in earth’s earliest atmosphere?
a. nitrogen
b. hydrogen
c. argon
d. oxygen

Which of the following statements is false regarding aromaticity? a. the compound must be cyclic b. the compound must be fully conjugated c. the compound must be planar d.the number of electrons in the pi system must satisfy the hückel 4n+2 rule e. the compound must have a neutral charge

In apex! a liquid heated beyond a certain temperature becomes

An atomic nucleus is composed ofa)protons.b)protons and neutrons.c)protons and electrons.d)protons, neutrons, and electrons.