Question

Why did Mendeleev leave blank spaces in his version of the periodic table? Mendeleev’s periodic table arranged elements in order of increasing atomic mass; spaces were left for elements not having the correct atomic mass. Mendeleev’s periodic table arranged elements in groups of similar chemical properties; spaces were left for elements not having a similar chemical property. Mendeleev’s periodic table arranged elements in order of increasing atomic mass; it was noticed that chemical properties repeated. Mendeleev predicted an element had not been discovered to fit the space.

Answer 1

The answer is Mendeleev’s periodic table arranged elements in order of increasing atomic mass; it was noticed that chemical properties repeated. Mendeleev predicted an element had not been discovered to fit the space.

Answer 2

The correct answer is, Mendeleev’s periodic table arranged elements in order of increasing atomic mass; it was noticed that chemical properties repeated. Mendeleev predicted an element had not been discovered to fit the space.

• Mendeleev who was responsible for publishing the periodic law for first time.
• It states as follows: the properties of the elements are periodic functions of their atomic mass.
• Mendeleev arranged elements in horizontal rows and vertical columns of a table in order of their increasing atomic mass.
• The elements with similar properties occupied the same vertical column or group.
• He left blank space for the undiscovered elements.
• Gallium and Germanium were unknown at the time Mendeleev published his periodic table.
• He left a gap under Aluminium and Silicon and called these elements Eka-Aluminium, Eka-Silicon.

Thus, we can conclude that, Mendeleev’s periodic table arranged elements in order of increasing atomic mass; it was noticed that chemical properties repeated. Mendeleev predicted an element had not been discovered to fit the space.

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