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Crust

Explanation: I know geology

#2 is C. mantle #6 is D. outer core

Explanation:

i only have time to answer two hope this helped

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.