So, I've found a number of somewhat obscure responses to this question but I'm looking for something concrete:
Why is the first affinity energy negative for most elements?
I appreciate that this is because energy is lost but why is energy being released rather than gained?
Am I also correct in thinking that the second affinity energy is positive because it's 'harder' to push an electron into an electron shell (due to electron shielding)?
Thank you in advance for your help :)