Exploring the Periodic Table of Elements

Who initially organized the periodic table by atomic mass?

• John Dalton

• Gilbert Lewis

• Dmitri Mendeleev

• Henry Moseley

In what year did Henry Moseley reorganize the periodic table by atomic number?

• 1905

• 1894

• 1922

• 1913

What term describes the vertical columns in the periodic table?

• Blocks

• Periods

• Series

• Groups

How many periods are there in the periodic table?

• 10

• 5

• 7

• 12

Elements in the same group have the same number of what?

• Valence electrons

• Neutrons

• Protons

• Isotopes

Which side of the staircase on the periodic table are non-metals found?

• Top

• Right

• Bottom

• Left

What are elements on the staircase of the periodic table called?

• Non-metals

• Noble gases

• Metals

• Metalloids

Which element is used in electron dot diagrams to represent outer electrons?

• Hydrogen

• Oxygen

• Carbon

• Helium

What maximum number of electrons can the outer energy level hold, except for hydrogen and helium?

• 2

• 32

• 8

• 18

Who developed the method to represent outer electrons using electron dot diagrams?

• Niels Bohr

• Dmitri Mendeleev

• Ernest Rutherford

• Gilbert Lewis