horizontal rows on the periodic table
vertical columns on the periodic table
negative subatomic particle
number of protons in an element
the electrons in the outermost energy level
number of protons and neutrons
represents an element
neutral subatomic particle
positive subatomic particle
Most of the elements in the periodic table
The elements that are in between the zigzag line on the periodic table.
metalloids or semi-metals
The elements that are on the far upper right corner of the periodic table.
Elements in the first group on the periodic table with one valence electron and are very reactive.
Elements in the second group on the periodic table with 2 valence electrons and are very reactive.
Alkaline Earth Metals
Elements in group 3-12 that have many useful properties.
Elements in group 17, known as “salt formers”
Elements in group 18, very unreactive. They are said to be “inert”.
The elements in the first period at the bottom of the periodic table.
The elements in the second period at the bottom of the periodic table.
Being unreactive with other elements