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Atoms and Elements

Who discovered small negatively charged particles called electrons? J.J. Thomson
Opposite charges do what with each other? Attract
Like charges do what with each other? Repel
What is the center of an atom which contains most of the atom's mass? Nucleus
What are the positively charged particles inside an atom's nucleus called? Protons
The particle that is found in the nucleus of an atom and has no electrical charge is a what? Neutron
In Ernest Rutherford's "gold foil experiment", he discovered that what is mostly empty space? An atom
Each energy level can hold a certain number of electrons. The first energy level is closest to what and can hold how many electrons? Nucleus and 2
When the first energy level is full, electrons begin to fill the second level. The second energy level can hold how many electrons? 8
When the second energy level is filled, electrons go to the next higher level. The last occupied energy level might or might not be filled. True
The electrons in the outermost level are called what? Valence electron
These outermost electrons are in involved in what? Chemical bonding
If the atoms of a substance have their outer energy levels filled, they are what? Which means, if the outer energy level is filled, the atom will not combine with another atom to form a new substance. Unreactive
Atoms with partially filled outer energy levels likely or unlikely to bond with other atoms? Likely
Electrons are located within an area around the nucleus called what? Electron cloud
What two parts of the atom has the same mass? Protons and Neutrons
What has a small mass? Electron
The most mass of an atom is found in the what? Nucleus
Pure substances that cannot be broken down into any simpler substance is a what? Element
Each element has atoms consisting of a specific number of what? Protons, neutrons, and electrons
The number of protons in an atom of an element is its what? Atomic number
Atoms normally have the same or different numbers of electrons as protons? The same
Atoms of the same element that have different numbers of neutrons are called what? Isotopes
The sum of the number of protons and neutrons in the nucleus of an atom is the atoms what? Mass number
Created by: bryantf