Oxygen is at the top of Group 16. It has an atomic number of 8.
Astatine is placed in group-17 in the Periodic Table. Its symbol is At.
Compounds are not placed in the periodic table.
Actinoids are placed in a separate row under the periodic table.
Non-metals are on the right side of the table (Phosphorous, Sulfur, Oxygen, Nitrogen, etc.)
If new elements are placed, then they would be appended in the periodic table. It won't disturb existing periodic table.
CO3 is not placed in periodic table. Only elements are arranged in periodic table.
Metals are placed at the left. Non-metals are placed at right in periodic table.
Oxygen is in Period 2 , Group 16 ( VI A) of periodic table
The abbreviation for potassium is " K " in the periodic table. It is placed in group-1 of the periodic table.
All chemical elements are placed in the periodic table.
Periods are placed horizontally in the periodic table of Mendeleev.
After lanthanum, thus the name.