Development of the Periodic Table

Who arranged the known elements into horizontal rows of increasing atomic mass leaving gaps for as yet undiscovered elements?

• Mendeleev

• Meyer

• Newlands

• Moseley

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 arranged the first periodic table.

• Mosely
• Einstein
• Mendeleev
• Bohr

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.

In the modern periodic table elements are arranged by:

• atomic mass

• atomic number

• valence electrons

• number of isotopes

Mendeleev classified elements based on not only atomic mass but what else?                                                   

• reactivity
• boiling points
• physical properties only 
•  chemical & physical properties

Which statement is not a difference between Mendeleev's table and the modern periodic table?

• there are no transition elements Mendeleev's table.
• Elements are arranged according to atomic no. not atomic mass.
• no gaps in the modern periodic table.
• much more than 60 elements in the modern periodic table.

Which scientist arranged the 60 known elements in columns of increasing atomic mass so that each column contained seven elements?

• Newlands

• Meyer

• Mendeleev

• Moseley

In what year did Newlands develop his Periodic Table of elements?

• 1913

• 1864

• 1869

• 1829