How to find the Mass number, protons, Neutron, electrons in an element?

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

How do you convert 4 mmol of bromobenzene to ml?

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h