Which statement about a solid, a liquid or a gas is correct?

2.2.1. Describe the structure of the atom as a central nucleus containing neutrons and protons surrounded by electrons in shells

2.2.2. State the relative charges and relative masses of a proton, a neutron and an electron

2.2.3. Define proton number / atomic number as the number of protons in the nucleus of an atom

2.2.4. Define mass number / nucleon number as the total number of protons and neutrons in the nucleus of an atom

2.2.5. Determine the electronic configuration of elements and their ions with proton number 1 to 20, e.g. 2,8,3

2.2.6.1. Group VIII noble gases have a full outer shell

2.2.6.2. the number of outer shell electrons is equal to the group number in Groups I to VII

2.2.6.3. the number of occupied electron shells is equal to the period number