How can I find the atomic number and atomic mass of an element?

CH4 valence electrons

Does sodium have a positive or negative charge after ionization?

Convert 6.3x1024 molecules of water to liters.

Which solution is the best conductor of electric current? 0.001 mole of NaCl dissolved in 1,000. mL of water 0.05 mole of NaCl dissolved in 1,000. mL of water 0.1 mole of NaCl dissolved in 1,000. mL of water 0.005 mole of NaCl dissolved in 1,000.

Which oxide (s) of manganese have a mass percent of the metal that is greater than 50%? MnO MnO2 Mn2O3All of these210

In the synthesis of barium carbonate from an alkali metal carbonate (M2CO3 where M is one of the alkali metals) a student generated 3.7 g of barium carbonate from 2.0 g of their alkali metal carbonate.

Give the state of matter that water is in as it moves through earths system

What happens to the volume of a substance as temperatures rises?

Find the total number of atoms in a sample of cocaine hydrochloride, c17h22clno4, of mass 22.5 mg.

What is the relationship between chemical equilibrium and the rates of forward and reverse reaction