Some Reminders About The Periodic Table Essay, Research Paper
Thanks to Doc Brown of ChemHelp.Net for these great chemistry revision notes. Check out his site for more! The elements are laid out in order of Atomic Number Hydrogen, 1, H, does not readily fit into any group
A Group is a vertical column of like elements eg Group 1
The Alkali Metals (Li, Na, K etc.), Group 7 The Halogens (F, Cl, Br, I etc.) and
Group 8 or 0 The Noble Gases (He, Ne, Ar etc.). The group number equals the
number of electrons in the outer shell (eg chlorine’s electron arrangement is
2.8.7, the second element down in Group 7).
A Period is a horizontal row of elements with a variety of
properties (more metallic to more non-metallic. All the elements use the same
number of electron shells which equals the period number (eg sodium’s electron
arrangement 2.8.1, the first element in Period 3).
On Period 4 is a horizontal row of ten elements between Group 2 and Group 3,
Sc to Zn are called the first Transition Metals Series of Elements