What process can be used to extract pure water from salt water ??
Describe the plum puffing model of the atom?
An atom of potassium has an atomic number of 19 and a mass number of 39. State the number of protons, neutrons and electrons in this atom.
an ion of potassium has -39 has 1+ charge. State the number of protons, neutrons and electrons in this ion.
