An atom has an atomic number of 16 and a mass number of 33. What is the symbol of the element?
As
How many protons does the atom contain
type your answer...
How many neutrons does the atom contain? type your answer
How many electrons does the atom contain? type your answer...

Harvey mixes two liquids. which observation of the new mixture most likely indicates a precipitate is forming?

Explain why scientists use shared characteristics to make cladograms.

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)