History of Periodic Table

Front

Who arranged the first periodic table?

Back

Mendeleev

Front

Which of these was not proposed by John Dalton in 1805?

Back

Atoms are made of protons, neutrons and electrons

Front

Particles in an atom's nucleus that are neutral and have no charge are?

Back

neutrons.

Front

Mendeleev classified elements based on not only atomic mass but what else?

Back

chemical & physical properties

Front

What was Dmitri Mendeleev's greatest contribution to the history of the periodic table?

Back

He predicted the existence (and properties) of new elements.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the significance of the periodic law?

Back

It states that the properties of elements are a periodic function of their atomic numbers.

Front

What are groups in the periodic table?

Back

Vertical columns that contain elements with similar chemical properties.

Front

What are periods in the periodic table?

Back

Horizontal rows that indicate the number of electron shells in the elements.

Front

What did John Dalton propose about atoms?

Back

All matter is made of atoms, which are indivisible and indestructible.