Question

someone check my answer plz

Which element is the most electronegative?

potassium (K)
manganese (Mn) <--- my answer
bromine (Br)

Answer 1

Electronegativity increases as you go up a column and to the right one any row - on the periodic table - culminating on F the most electronegative atom (This trend excludes the noble gases).

Br is the most electronegative element in this list (look at their positions on a periodic table).

Answer 2

Which element has 2 more protons than iron (Fe)?

chromium (Cr)
osmium (Os)
nickel (Ni) <--- my answer

Answer 3

@aaronq