What is the price of a gram of Lithium, Sodium, Potassium, Rubidium, Cesium, Francium It’s to make some flash cards

Seawater contains approximately 3.5%nacl by mass and has a density of 1.02 g/ml. what volume of seawater contains 7.5 g of sodium?

The reaction q+r2=r2q is found to be first order in r2 and

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.