Iron (for making steel), copper and aluminium is obtained from substances found in the Earth’s crust. The metals are made into many useful things. When no longer required, the metal articles are thrown away as waste or recycled. Explain why it is important to recycle these metals, rather than put them in general household waste?

answer; economic order quantity;

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.

answer carbon and three oxygen atoms;