Answer: it reacts with the alkali metals (M) to form a salt MX, where X is the halogen.
Explanation: Group 7A elements are halogen and they react with alkali metals like Sodium or potassium to form a salt like NaCl
Answer: Aluminium
Explanation:
The metals are solid substances, they have shiny luster, they conduct electricity and have high melting point. The aluminium is a kind of metal that have a solid surface, it has a shiny luster, the surface of metal appears to be polished. It conducts electricity and can be used in electrical cords, connections, and devices. It has a high melting point.
<span> They are called that because while the outermost level contains at most two electrons, they are next to outermost main levels have incompletely filled d sub-orbitals, which are filled-up progressively on going across the periodic table from 8 to 18 electrons. The filling of the d sub-orbitals of the transition elements across a row of the periodic table is not always regular.</span>
