History of the Periodic Table

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

• He arranged all of the known elements by their atomic number
• He realised that there was a pattern of reactivity which repeated every 8 elements
• He predicted the existence (and properties) of new elements
• He identified the "law of triads" which became the groups

The periodic table is organized by the number of ______ in each element's nucleus

• neutrons
• protons
• electrons
• atoms

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Who arranged the first periodic table.

• Mosely
• Einstein
• Mendeleev
• Bohr

What property did Menedleev use to organize his first periodic table?

• atomic number
• atomic mass
• alphabetical order
• chemical properties

Why did scientists need/want to organize the elements?

• Scientists like things organized
• make it easier to understand the elements
• have one list of the known elements.
• none of the above

Why were there blank spaces left in Mendeleev's periodic table?                                              

• He didn't know what to put there.
•  Undiscovered elements not yet known.
• Multiple elements could have fit
• He forgot to add the elements in.

Moseley discovered that the ________ was the most fundamental property needed for organization.                                                 

• atomic mass
• mass number
• atomic number
• number of protons

A ___________ is an arrangement of elements in columns

• columns
• rows
• periodic table
• electron shell

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In the modern periodic table elements are arranged by:

• atomic mass

• atomic number

• valence electrons

• number of isotopes

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I am a British scientist who came up with today's periodic table of elements that is based on ATOMIC NUMBER. Who am i?

• Henry G.J Mosely

• J.J Thomson

• Erwin Schrodinger

• John Dalton

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