If I have a dry bulb temperature of 18 degrees C and a wet-bulb temperature of 10 degrees , what is the wet-bulb depression (the difference between the two)?

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

a electronegativity decreases beacuse the size of nucleus is bigger.

c) should be the answer.