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Element Review

SOL 6.5a Vocabulary

QuestionAnswer
atom the basic building block of matter
proton positively (+) charged subatomic particle
electron negatively (-) charged subatomic particle
neutron neutrally (0) charged subatomic particle
the 1st to propose the idea that atoms could exist Democritus
nucleus the center of an atom containing the protons & neutrons
electron cloud the negative "haze" that is created around the nucleus of an atom by fast moving electrons
subatomic particles the parts of an atom; protons, electrons, & neutrons
atomic Mass The overall mass of the atom (its # of protons & neutrons)
element a pure substance made of only one type of atom (they cannot be broken down into any other substance)
atomic number the number of protons in a elements atom
atomic symbol the symbol (letter) that represents the element on the Periodic Table
Li Lithium
He Helium
what makes one element unique from another? the number of protons in its nucleus
chemical symbol for lead Pb
what are the rules for writing element symbols? a. One letter symbols must be capitalized b. Two letter symbols have the second letter lowercase
two different elements with neutral atoms can have the same number of which subatomic particle? neutrons
in a neutrally charged atom, which two subatomic particles are equal? protons & electrons
elements on the Periodic Table are divided into three (3) groups. These groups are........ metals, non-metals, & metalloids
Why some elements symbols don't match their names on the Periodic Table. their symbolsl are taken from their Latin names.
Created by: romanomd
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