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Published byMaurice Maxwell
Modified over 4 years ago
Atomic number – number of protons Mass number – number of protons + neutrons Protons (+)electrons (-) Neutrons (neutral) Energy levels contain electrons: 1st = 2 2 nd = 8 3 rd = 18
Chemical symbol - always printed, never in script - Capital and lower case matter Co = cobalt CO = carbon monoxide
Periodic table – elements are arranged by atomic number
Chemical formula – how many of which atom are in a molecule coefficient = number of molecules subscript = number of atoms 2H 2 O = 2 water molecules, with 2 hydrogen atoms and 1 oxygen in each
Sodium: Atomic #11 Mass #23 P = 11 N = 12 E = 11
The Periodic table. Periodic Table Elements are classified by their weight and how they react.
Chemical Formulas & Equations. Molecule A combination of two or more atoms bonded together.
Counting Atoms Obviously, there are more materials in the world than just 100 or so elements on the periodic table.
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Atoms. Particles of an Atom Atom: smallest amount of an element ParticleRelative Mass ChargeLocationOther Info Proton nucleusIdentifies the element.
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Chemical Formulas. Chemical Formula: An easy way for scientist to describe a molecule using the element symbols. H2OH2O C0 2 NaCl.
Chemistry 101. Elements are completely pure. All Matter is made up of Elements They are only made of one type of ATOM HELIUM ATOM.
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Structure of the Atom. Chemical symbol- an abbreviated way to write the name of an element. Chemical symbol- an abbreviated way to write the name of an.
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Atom The basic building block of all matter. Greek for átomos: undivided Material from:
Pure Substances and Mixtures. Pure substances cannot be broken down by physical means.
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