3. what is the general trend in each of the following properties for the halogens as the atomic number decreases?
ionization energy
general reactivity
boiling point
atomic volume
i need about this

i believe it is c.) 1575 j.

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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