(ii) Which of these gases are:(a). elements (b). compounds.​

c (diamond),

sio2 (quartz)

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

idk what is it? is this a question that you know the answer or u dont