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Chapter 8: Model of matter: Atoms and molecules - Coggle Diagram
Chapter 8: Model of matter: Atoms and molecules
cellulose is made up of carbon, hydrogen and oxygen chemically combined.
structure of an atom
proton
forms the nucleus
particles that is positively charged
mass=1
neutron
particle with no charge
electron
negatively charged and moves out of the nucleus at high speed
mass=1/1840
top number =proton, bottom number=neutron(can change)+proton, electron=proton
representation of atoms and molecules
same particle, same size
chemical formula
H2 is hydrogen with 2 atoms, CO2 is 3 atoms
elements need to remember
ammonia is NH3
isotopes
two atoms of same element that have same proton but diff no. of neutron
valence is the no. of electrons in the last shell outside of nucleus
dot and cross diagram
each shell max: 2.8.8.2
to form ion, add or lose atoms, lose x electron, write x+, if x=1, write + only, gain x electron, write x-, for gain electron, replace gaiined electron with the opposite of what you wrote, if write X, then write o/
periodic table hacks
period number= number of shells
group number = how many electron in valence shell