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

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