How do you find the atomic mass mass number of an atom?

a. add the number of protons and neutrons together

b. subtract the number of protons by the number of neutrons

c. add the number of protons and elections together

d. subtract the number of protons by the number of neurons

they are made of gases.

they have a spherical shape.

they make energy through fusion.

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