How many unpaired electrons are in the beryllium atom?

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.

What is the vapor pressure of a solution with a benzene to octane?

8. what happens to matter during a chemical reaction