A student finds a substance in a mine. He takes it to a lab and finds that it is a solid, it's made of only one substance, and it does not contain organic matter. What has he found?

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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

the correct answer to this question is 2