What does the identity of an element depend on the number of? A. protons in the atom
B. electrons in the atom
C. protons and neutrons in the nucleus
D. neutrons in the atom

A. protons in the atom

Explanation: I just took the test and got a 100% so this should be right. Unless the question is worded differently than mine then it should be right. Hope this helps :)

am i too late?

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