Dmitri Mendeleev and the Periodic Table.

Front

Who is Dmitri Mendeleev?

Back

A Russian chemist known for creating the first version of the Periodic Table of Elements.

Front

What year did Mendeleev publish his first Periodic Table?

Back

1869

Front

What is the significance of Hydrogen in Mendeleev's work?

Back

Hydrogen was used as a reference point for determining the atomic masses of other elements.

Front

What type of elements are hardest to predict according to Mendeleev?

Back

Radiated elements.

Front

Which elements did Mendeleev predict accurately?

Back

Gallium, Germanium, and Scandium.

Front

Why is the Periodic Table called 'Periodic'?

Back

Because elements periodically have similar properties.

Front

What is the Periodic Law?

Back

The properties of elements are a periodic function of their atomic masses.

Front

What are periods in the context of the Periodic Table?

Back

Horizontal rows in the Periodic Table that indicate the energy levels of the elements.

Front

What are groups in the context of the Periodic Table?

Back

Vertical columns in the Periodic Table that group elements with similar chemical properties.

Front

What is an atomic mass?

Back

The weighted average mass of an element's isotopes, measured in atomic mass units (amu).