Where does much of earth's internal heat come from?

it should be all of them because it asks if you included all of those in your answer

explanation:

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

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

gold is my favorite solid.