abbreviations for chemical elements. Usually consists of the first or first two letters of the element name
element symbols
elements made of tiny particles
atoms
distinct substance that is composed of the atoms of two or more elements
compound
atoms contain negative particles called _____
electrons
created by J. J Thomson, concluded that an atom might look something like a _________
Plum Pudding Model
an atom with a dense center of positive charge
nucleus
developed by Ernest Rutherford in which a small positively charged nucleus is surrounded by planetary electrons
nuclear atom
same size as an electron but has a positive charge
proton
slightly bigger than electron and has no charge
neutron
atoms with the same number of protons but different numbers of neutron
isotopes
the number of protons in a nucleus of an atom
atomic number
the sum of the number of neutrons and the number of protons in a given nucleus
mass number
this chart shows all of the known elements
periodic table
the columns of the periodic table are called _____
groups
first column of elements is called ______
alkali metals
second column of elements is called ________
alkaline earth metals
seventh column of elements is called ______
halogens
eighth column of elements is called_____
noble gases
a large collection of elements that spans many vertical columns
transition metals
appear in the right upper hand of the periodic table. Lack the properties of metals
nonmetals
silicon, germanium, arsenic, antimony, and tellurium are ______
metalloids
a charged entity
ion
a positive ion
cation
negatively charged ion
anion
the types of atoms and the number of each type in each unit of a compound are expressed by this.
chemical formula

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