Measuring the level of lead in drinking water is the job of?

Analytical chemistry is the field of chemistry which deals with the application of methods used for separation, identification and quantification of the elements present in the sample or specimen under concern.

The lead can be identified, separated and quantified by the methods used in the analytic chemistry present inside the water. Therefore, measuring the level of lead in drinking water is the job of analytical chemistry.

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