Development of the Periodic Table

Whose Periodic Table of Elements was the most accurate?

• Newlands'

• Mendeleev's

• Meyer's

• Moseley's

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

• 1913

• 1864

• 1869

• 1829

How accurate was Mendeleev's Periodic Table of Elements?

• Fairly

• Very

• Extremely

• Not very

In what year did Moseley release his Periodic Table of Elements?

• 1913

• 1870

• 1869

• 1864

A ___________ is an arrangement of elements in columns

• columns

• rows

• periodic table

• electron shell

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Why did Mendeleev leave blanks in his periodic table?

• forgot elements

• left room for elements not yet discovered

• placed elements in wrong positions leaving gaps

The usefulness of Mendeleev's periodic table was confirmed by

• the discovery of electrons

• the discovery of predicted elements

• its immediate acceptance by scientists

• the discovery of the nucleus

In the modern periodic table elements are arranged by:

• atomic mass

• atomic number

• valence electrons

• number of isotopes

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

The atoms along the staircase are called 

• metals

• nonmetals

• metalloids

• noble gases

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