The can be described as the basic unit of life. (2 points) atom neutron cell nucleus

the cell can be the described as the basic unit of life

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

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.