Classification of Elements

Who created the first real periodic table?

• John Dalton

• Albert Einstein

• Dmitri Mendeleev

• Marie Curie

Answer explanation

Dmitri Mendeleev is credited with creating the first real periodic table in 1869, organizing elements by atomic mass and properties, which laid the foundation for modern chemistry.

Who developed the periodic table after Mendeleev?

• John Dalton

• Marie Curie

• Dmitri Mendeleev

• Glenn T. Seaborg

Answer explanation

Glenn T. Seaborg developed the modern periodic table by introducing the actinide series and reorganizing elements based on atomic number, building on Mendeleev's foundational work.

What is the modern periodic table based on?

• The atomic number of elements.

• The chemical properties of elements.

• The mass of elements.

• The color of elements.

Answer explanation

The modern periodic table is organized by the atomic number of elements, which reflects the number of protons in an atom's nucleus. This arrangement highlights the periodicity of chemical properties, making it the most accurate basis for classification.

Which scientist is known for the modern arrangement of the periodic table?

• Henry Moseley

• Ernest Rutherford

• Dmitri Mendeleev

• Robert Millikan

What did Mendeleev predict about undiscovered elements?

• They would have properties similar to known elements.

• They would not exist.

• They would be heavier than all known elements.

• They would have no relation to the periodic table.

moseley arranged the elements according to .................

• atomic number

• atomic weight

Mendeleev put elements in vertical rows according to ......

• atomic weight

• atomic number

• properties

The number of periods and groups in the

periodic table are______.

• 6,16

• 7,17

• 8,18

• 7,18

The basis of modern periodic law is______.

• atomic number

• atomic mass

• isotopic mass

• number of neutrons

Which scientist is credited with the discovery of the electron and how did this discovery impact the classification of elements?

• J.J. Thomson; it led to the understanding of atomic structure and electron configuration.

• Ernest Rutherford; it led to the discovery of the nucleus.

• Niels Bohr; it led to the development of the Bohr model.

• Dmitri Mendeleev; it led to the creation of the periodic table.

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