Place books, purses, and such items in the designated storage area. take only laboratory manuel’s and notebooks into the work area
true or false

True

Explanation:

When you come in you should have all of your personal items put in a safe place and only have tools that will help with your experiment

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

the answer is barium and copper bromide