how does atheism/materialism account for

[Jim__]

23. We can begin by looking at one of these things, say love.

Love can be viewed as a set of behaviors, different behaviors in different contexts. In a family context parental love for the children is complemented by the children's love for the parents; and this love can be described by behaviors, for instance,parents feeding the children and the children responding by obeying the parents (I'm speaking of general trends and am aware that some specific events will not fit - IOW I know the children we love can sometimes be a pain in the ass). These behaviors keep the family together and this is important from a survival perspective, so these behaviors would likely be selected for. So, selection can account for these behaviors, and the similar behaviors associated with the other aspects of love and the other words in your list.

My guess is that you're not really asking about behaviors but about the deep subjective feelings that are associated with these terms. Feelings that can at times be so strong that they almost compel the individual to act. It's easy to see that strong subjective feelings that reinforce survival enhancing behaviors are advantageous. We can account for the feelings in that way - they enhance beneficial behaviors. But, I don't believe that the question of how we get from biological processes - e.g. communication across a neural network - to subjective emotional experience has been answered. I don't believe the feelings have yet been fully accounted for.