Founders of the Periodic Table

Who arranged the elements by increasing atomic number?

• Mendeleev

• Mosely

• Dobereiner

• Newlands

Who came up with the law of octaves?

• de Chancourtois

• Mosely

• Mendeleev

• Newlands

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

Who is credited with arranging the first periodic table.

• Mosely

• Einstein

• Mendeleev

• Newland

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

1. Who first grouped elements in families (similar chemical and physical properties)?

• Newlands

• Mendeleev

• Dobereiner

• Moseley