Physics, 27.05.2021 15:40 deezzzy

I am an element. I have a high electron affinity (highly negative value) and my atomic number is X. The element with atomic number X - 1 has
a lower ionisation energy and a lower electron affinity. The element with
atomic number X + 1 has a higher ionisation energy and basically no
electron affinity (positive value). I am toxic in my elemental state, but I
am very commonly found in my nontoxic ionic form. Within my group,
I have the second highest ionisation energy. Who am I? (Support each
step of your reasoning.)

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I am an element. I have a high electron affinity (highly negative value) and my atomic number is X....