.Which of the following is true about elements? They are impure substances.
They cannot be classified by their properties alone.
They cannot be broken down into simpler substances.
They have more than one kind of particle.

Find the protons, electrons and neutrons for strontium with a mass of 83

Alarge marble is dropped in a graduated cylinder with 35ml of water in it.the water level increases to 49ml.what is the volume of the marble

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h