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.
Atoms 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).
Electrons are
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.
How small is an atom? Watch this entertaining TedEd video!
Mendeleev designed 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). This is an AMAZING Video about Mendeleev and his PT!
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 ...
6 years ago
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