What is the most corrosive element in the periodic table?

Fluorine.

Explanation:

Fluorine is very corrosive and has to be stored in a special ventilated gas cabinet and it is recommended to install a fluorine gas monitoring system for large cylinders of fluorine,

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so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer