4.1 The Development of the Periodic Table of Elements

The statement below is a pattern discovered by a scientist in the development of the Periodic Table.

Similar properties are observed at every eight element when the elements are arranged in increasing atomic mass.

• Johann W.Dobereiner

• John Newlands

• Dmitri Mendeleev

• Henry Moseley

The following statements referred to the contributions of a scientist in the development of the Periodic Table

-Plotted a graph of square-root of the frequency against the proton number

-Arrange the element in the Periodic Table based on increasing proton number

Who was the scientist?

• Lothar Meyer

• Henry Moseley

• John Newlands

• Dmitri Mendeleev

The group consisting of _______ was named triad.

• Chlorine, Cl

• Bromine, Br

• Fluorine, F

• Iodine, I

Who is the scientist that classified the elements with the same chemical properties into a group called triads?

• Dmitri Mendeleev

• John Newlands

• Antoine Lavoisier

• Johann W.Dobereiner

Who was the scientist that left gaps in the Periodic Table for elements which were not known at that time?

• John Newlands

• Antoine Lavoisier

• Lothar Meyer

• Henry Moseley

Antoine Lavoisier classified all elements according to certain groups such as __________

• Gases

• Non-metals

• Metals

• Metal oxides

Who named the arrangement as the Law of Octaves?

• Johann W.Dobereiner

• John Newlands

• Dmitri Mendeleev

• Henry Moseley

Which of the following can be predicted based on the position of an element in the Periodic Table of Elements ?

• The relative atomic mass of the element.

• The number of neutrons in the nucleus of the element.

• The number of isotopes of the element.

• The charge of the ion of the element.

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NGSS.HS-PS1-1

Elements in the Periodic Table of Elements are arranged in_______.

• Descending order of proton numbers

• Ascending order of proton numbers

• Ascending order of nucleon numbers

• Descending order of number of electrons

The following statements referred to the contributions of a scientist in the development of the Periodic Table.

He arranged the elements in order of increasing atomic mass

He was also able to predict the properties of undiscovered elements.

Who was the scientist?

• Lothar Meyer

• Henry Moseley

• John Newlands

• Dmitri Mendeleev