The Periodic Table

In Term 1, I was taught about the Science topic Chemistry, and I had leaned about the Periodic Table, which is one of the most important parts of Chemistry. It is actually a tabular display of the 118 known chemical elements, and they are organised by selected properties of their atomic structure. The elements in the Periodic Table are presented by increasing atomic number, which is the same as the number of protons in their atom's atomic nucleus. The horizontal rows separating the elements are known as periods, from 1-7, and the vertical columns separating the elements are known as groups, from 1-18 (group 18 is also referred to as group 0).
Elements of the same period have the same number of electron shells, while elements in the same group have the same electronic configurations. Although the Periodic Table of Elements is an extremely complicated part of Chemistry, and I find it quite hard to comprehend as well, I will make it an effort to find out what I am lacking in knowledge and I will improve on my Chemistry in this way.
Periods
Period 1 contains the least number of elements, having only 2. It therefore does not follow the octet rule.
Period 2 contains the biology most essential elements, which involves the 2s and 2ps orbitals.
Period 3 contains elements which occur in nature and have at least 1 stable isotope.
Period 4 contains essential elements which have biological roles.
Period 5 contains heavier elements which have biological roles.
Period 6 contains mostly toxic and radioactive elements, excluding platinum and gold.
Period 7 contains elements which are all heavy and highly radioactive.
Groups
Group 1 is the alkali metals or lithium family.
Group 2 is the alkali earth metals or beryllium family.
Group 3 is the scandium family, which consists of rare earth elements.
Group 4 is the titanium family.
Group 5 is the vanadium family.
Group 6 is the chromium family.
Group 7 is the manganese family.
Group 8 is the iron family.
Group 9 is the cobalt family.
Group 10 is the nickel family.
Group 11 is the coinage metals or copper family.
Group 12 is the zinc family.
Group 13 is the boron family.
Group 14 is the carbon family.
Group 15 is the pnictogens or nitrogen family.
Group 16 is the chalcogens or oxygen family.
Group 17 is the halogens or fluorine family.
Group 18 is the noble gases, or helium family or neon family. It is also referred to as Group 0.