In most elements the valence shell holds a maximum of how many electrons

How many miles are in one light year?

Calculate the number of carbon atoms in 25.0 grams of isopropyl alcohol (c3h8o)

What do all prokaryotes and eukaryotes have in common? A. They are unicellular organisms. B. They are multicellular organisms. C. The cells that make them up each contain genetic information. D.

Mercury metal is poured into a graduated cylinder that holds exactly 649mL. The mercury used to fill the cylinder weighs 332g. From this information, calculate the density of mercury.

What type of energy transformation is ocuring in this closed series circuit? A) thermal energy into light energy B) sound energy into thermal energy C) electrical energy into light energy D) light energy into electrical energy

It would take one light year to travel to the sun? True or false?

A specific, electrically neutral atom of boron has 5 protons, 5 electrons, and 6 neutrons. what is the mass number of this atom of boron? 6 5 11 16

When does hail happen?

For the reaction, calculate how many moles of the product form when 0.012 mol of O2 completely reacts. Assume that there is more than enough of the other reactant. 4Al (s) + 3O2 (g) →2Al2O3 (s) Express your answer using two significant figures.

Nuclei with too many or too few neutrons are?