Lab Safety What should you do if a piece of lab
equipment is broken?
J. Try to fix it.
k. Tell a teacher immediately.
L. Pick up broken glass immediately
before anyone gets hurt.
M. Pretend like nothing happened.
Q3

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

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

Noble gases is far right

Perimeter? wheres the answers