Required Scientists use satellites to communicate and to monitor and record Earth's radiation from space
In which example would a scientist most likely be monitoring and recording infrared radiation?

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

you need to have a picture of the atom that way we can answer it