table

• noble gases are unreactive because they all have full outer shells
• metals always lose electrons
• as the number of shells increases, so does the boiling point
• the greater number of shells the greater the size of particles
• the greater size of molecules, the greater the strength of the intermolecular forces
• group 7 elements are known as halogens
• group 0 are known as noble gases
• fewer shells means a greater attraction between the outer electrons and the nucleus, so the atom is able to gain an electron more easily