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chem unit 2

QuestionAnswer
the scientist who discovered the nucleus Rutherford
the group of elements that tend to gain electron nonmetals
protons, neutrons, and electrons are called subatomic particles
an atom or group of atoms with a positive or negative charge ion
the atomic number represents how many ___ there are protons
the ____ is the number of protons and neutrons added together in an atom mass number
the name of the experiment used to discover the nucleus gold foil
electrons that are lost create this cation
the scientist who discovered the neutron Chadwick
atoms of the same element that have different numbers of neutrons isotopes
the scientists who discovered the electron Thomson
The first person to think about an atom's existence Democritus
Electron that are gained create this type of ion Anion
The group of elements that tend to lose electrons metals
________ discovered that the center of the atom was very small and dense with an overall positive charge in his gold foil experiment Rutherford
The subatomic particle with a positive charge is called protons
The ________ is always equal to the number of protons + the number of neutrons that the atom has mass number
an atom that gains an electron will have a ______ charge negative
According to Dalton, atoms of different elements will be _________ different
the ______ of an element is the weighted average of the masses of the different isotopes of that element atomic mass
both the neutrons and _______ are found in the atom's nucleus protons
the atomic number of an atom is always equal to the number of ___________ protons in a nucleus
the proton has a mass of approximately 1 atomic mass
_________ are atoms that have the same atomic number but different mass numbers Isotopes
Democritus said that ________ were indivisible, fundamental unites of matter atoms
An atom gets an overall positive charge by __________ ____________ losing electrons
Created by: cwong
 

 



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