Periodic Table

Scientist who first grouped the elements in groups of threes (triads).

• Johann Dobereiner
• John Newlands
• Demitri Mendeleev
• Henry Mosely

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Each column(up&down) in the periodic table is called a 

• period
• group
• cluster
• unit

The yellow atoms are called 

• metals
• nonmetals
• metalloids
• noble gases

Tags

NGSS.HS-PS1-1

The period for Bromine is ___________.

• 3
• 2
• 4

Beryllium is in group number______.

• Group 2
• Group 3
• Group 4
• Group 7

The periodic table has __ periods.

• 18
• 8
• 2
• 7

An element's identity is determined by the number of

• electrons.
• protons.
• neutrons.
• valence.

Group 18 elements are known as the _____ _____ and have full valence shells.

• royal gases.
• supreme solids.
• noble gases.
• legit liquids.

Elements in the same ________ are more chemically similar.

• group
• period
• club
• table

Tags

NGSS.HS-PS1-1