Post on 31-Dec-2015
Periodic Table Arrangement
Basic Facts
• Elements are arranged by increasing atomic numbers
• Metals, non metals and metalloids
• Groups and Periods
Periods
• Also known as rows• The atomic number increases by
one• Tells the number of shells• Mass number increases slowly• Examples: Li, N, Ne
Groups
• Also known as columns• Tells the number of electrons in the
outermost shell• Atomic increases by more than one• Mass goes up by a lot• Example: Noble gases
Metals
• Found to the left of the staircase• They give their valence electrons away• Conduct heat and electricity, are
ductile and malleable• Have 1, 2 or 3 valence electrons• Examples: Calcium, Sodium and
Aluminum• Ionic charge is positive
Non Metals
• Found to the right of the stair case• They take valence electrons• They are brittle, dull and no
conductivity• Have 4, 5, 6, 7 or 8 valence electrons• Examples: Sulfur, Carbon and
Chlorine• Ionic charge is negative
Metalloids
• Found along the stair case (either side of the stair case)
• Give and take electrons• Have the properties of both metals
and non metals• Ionic charges can be positive or
negative• Example: Silicon and Arsenic
THE END!!!