Atom
Periodic table 1
General
Charges
Periodic table 2
100
negatively charged subatomic particle located outside of the nucleus in energy levels
What is an electron
100
amu, gives the relative masses of the atoms relative to carbon-12
What is atomic mass units
100
Rutherford used high-speed, lightweight atoms called alpha particles to bombard very thin pieces metal proving the atom had a dense nucleus of positive charge
What is the gold foil experiment
100
a charged atom with too many or too little electrons
What is ion
100
an atom with the same number of protons but different number of neutrons
What is an isotope
200
neutral subatomic particle located in the nucleus bonded to the proton
What is neutron
200
the number of protons, they are used to configure the Periodic Table
What is atomic number
200
number that gives a weighted average of all known isotopes usually with a decimal
What is atomic mass
200
negatively charged atom with an excess of electrons
What is an anion
200
the other name for series of elements in horizontal rows
What is period
300

shells that hold electrons, the first one holds two, the second holds eight, the third up to 18

What energy levels

300
an abbreviation of the element’s name, sometimes in Latin or German
What is chemical symbol
300

developed by scientist over time as each one gave evidence to help others to develop a model of the atom

What is atomic theory

300
an atom with a positive charge, more protons than electrons
What is a cation
300
an organized map of all the elements based on atomic numbers
What is periodic Table
400
the center of the atom where protons and neutrons are located
What is the nucleus
400
vertical columns of elements or families that have similar chemical properties
What is group
400
the general components with charge and mass that make up the atom
What is subatomic particles
400
dynamic space around the atom divided into energy levels that hold electrons
What is electron cloud
400
a very strong bond that acts over a short distance in the nucleus between neutrons and protons
What is strong nuclear force
500
positively charged subatomic particle found in the nucleus of the atom, determines identity of an element
What is proton
500
the sum of neutrons and protons
What is mass number
500
he used high-speed, lightweight atoms called alpha particles to bombard very thin pieces of gold foil proving the atom had a dense nucleus of positive charge
What is Ernest Rutherford
500
electrons located on the outer energy level of an atom used for bonding
What is valence electrons
500
a full outer energy level of two or eight electrons making a stable atom
What is an octet
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