Atomic size decreases from left to right in a period hence ioniztion energy increases from left to right.But atomic size increases from top to bottom in a group hence ionization energy decreases from top to bottom.
Atomic Mass Octaves and Triads
A Russian chemist named Dmitri Mendeleev wrote it and this periodic table was a table to illustrate recurring trends in the properties of elements.
Studying physical and chemical properties of chemical elements it is possible to recognize some trends in the periodic table.
Reactivity increases the farther down you go in the Periodic Table.
The noble gases
Periodic trends affect bonding due to the arrangement of the elements on the periodic table. The periodic table only includes chemical elements.
Periodic patterns and trends
in 1869 periodic trends in the properties of the then-known elements
The periodic trends that arise from the arrangement of the periodic table provide chemists with an invaluable tool to quickly predict an element's properties. These trends exist because of the similar atomic structure of the elements within their respective group families or period and the periodic nature of the elements.
The rows are used to study the change in trends. There are 7 periods in periodic table.
he arranged his Periodic Table by each elements Atomic Mass
Atomic Mass Octaves and Triads
atomic mass, triads, and octaves
A Russian chemist named Dmitri Mendeleev wrote it and this periodic table was a table to illustrate recurring trends in the properties of elements.
Studying physical and chemical properties of chemical elements it is possible to recognize some trends in the periodic table.
Reactivity increases the farther down you go in the Periodic Table.
On the periodic table there is no such order of first and second as asked in the question.