Dmitri Mendeleev and Periodic Table Concepts

His father's success as a renowned scientist.

His mother's determination to send him to university despite family hardship.

His discovery of a new element at a young age.

His early recognition by the Russian Academy of Sciences.

Elements with similar properties appeared randomly.

Element properties repeated in a periodic manner.

Elements always reacted with the same type of other elements.

Elements became less reactive as their atomic weight increased.

He suggested that some elements had incorrect atomic weights.

He proposed that new elements would be discovered to fill the gaps.

He believed that elements could change their properties over time.

He concluded that his theory of periodicity was flawed.

They are generally unreactive and stable.

They readily gain electrons to form negative ions.

They are soft, shiny, extremely reactive and have 1 valence electron.

They are typically found in their pure form in nature.

They readily form cations with a 1+ charge.

They have very high electronegativities.

They possess two electrons in their outer shell.

They are generally more reactive than alkali metals.

They are highly reactive and form anions.

They are poor conductors of electricity.

They exhibit a wide range of oxidation states.

They have very low melting and boiling points.

They have low ionization energies and are unreactive.

They typically form anions with a 1- negative charge.

They possess a complete valence electron shell.

They are found in the middle body area of the periodic table.

He was the first to discover the existence of electrons.

He published his table in a cylindrical, three-dimensional format.

He recognized the far-reaching implications of elemental periodicity.

He denied the existence of atoms, focusing only on observable properties.