What’s Neon family number? And period?

18 and Period 2

Explanation:

Neon (Ne), chemical element, inert gas of Group 18

Neons period on the periodic table is period 2.

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

fe 55.85 g/mol and h2o 18.02 g/mol.