What is the relative acidity of tomato juice (ph 4) and milk (ph 6)?

Which substances have the lowest melting points: ionic covalent, or metallic

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride