Periodic Table History 24-25

Front

What is the modern arrangement of elements in the periodic table based on?

Back

Atomic number.

Front

Why did Mendeleev leave blank spaces in his periodic table?

Back

Undiscovered elements not yet known.

Front

Who is credited with arranging the periodic table by increasing atomic number?

Back

Mosely.

Front

Who developed the first periodic table and arranged elements by increasing atomic mass?

Back

Dmitri Mendeleev.

Front

What property did Mendeleev use to order his periodic table?

Back

Atomic Weight.

Front

What is the significance of atomic number in the periodic table?

Back

It determines the position of an element in the periodic table and its chemical properties.

Front

What was a major limitation of Mendeleev's periodic table?

Back

It was based on atomic mass, which led to some inconsistencies.

Front

How did Mosely improve upon Mendeleev's periodic table?

Back

By arranging elements according to atomic number instead of atomic mass.

Front

What is the periodic law?

Back

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

Front

What are groups in the periodic table?

Back

Columns of elements that have similar chemical properties.