Atoms, or elements, are the smallest unit of matter. They retain their identity in chemical reactions and are combined to form compounds and everything in the universe.
have some basic parts. Protons and Neutrons are found in the nucleus
and make up the atomic mass. To find the number of neutrons, you
subtract the atomic number (number of protons) from the atomic mass
number (protons plus neutrons).
so tiny that they do not influence the atomic mass. They are found
orbiting the nucleus in shells or orbitals. Atoms are neutral so the
number of protons equals the number of electrons.
We talked about the periodic table on Friday. Mendeleev
deisgned the periodic table by looking at the properties of elements on
cards and arranging them different ways until he got a system that
worked. No one told him how to do it, he just did it until it worked. He
even left spaces for elements that were discovered in his lifetime. (More info about Mendeleev)
His periodic table was set up according to atomic mass number. The
current table, altered slightly by Moseley, is organized by atomic
number (number of protons).
Next we discussed regions
of the periodic table, colored them, and labeled them. Periods are
horizontal rows (periods go at the end of a sentence) and there are 7
periods. There are 18 groups or families (vertical columns) and a few of
them have special names. This a pretty excellent diagram. This website gives a lot of helpful information.
Global Ocean Conveyor - Today students began class with a BrainPop on currents and took the quiz. Tim and Moby did an excellent job describing how currents affect global weather ...
4 months ago