Which on the following is not a acid? A. HCl B. H2SO4 C. NaOh D. HN03

     HN03 is not an acid at all!

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

you need to have a picture of the atom that way we can answer it