by atomic number
because they have different elements in a one block.
From the periodic table. It's all abbreviations for the elements that make up oxygen
Electronic Structure
The letter "i" does not represent any specific element on the periodic table. The elements on the periodic table are typically represented by one or two letter abbreviations.
Abbreviations of elements are short symbols used to represent the names of chemical elements in the periodic table. For example, "H" is the abbreviation for hydrogen, "O" for oxygen, and "Na" for sodium. These abbreviations make it easier and more convenient to refer to elements in chemical formulas and equations.
Symbols of elements areEnglish or latinwords or roots.
It is named The PERIODIC TABLE. The periods being the horizontal rows The groups being the vertical columns.
They use the periodic table of elements. They all have their own abbreviations.
It is called the Periodic Table of Elements.
You need to clarify this question. Do you mean, "How is the number of protons determined in the periodic table of the elements?"
There are 53 Elements in the Periodic Table.
Number of protons in the nucleus (=atomic number)