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Atoms Vocabulary

TermDefinition
ATOM The smallest part of an element that still has the chemical properties of that element. Atoms are made up of even smaller particles such as protons, neutrons, and electrons.
PROTON A particle in the nucleus of an atom that has a positive charge. The number of protons in the nucleus determines the element the atom forms and its atomic number.
ELECTRON A tiny particle, much smaller than an atom, that is charged with a small amount of negative electricity. All atoms have electrons surrounding the nucleus at different distances.
NEUTRON A subatomic particle with no electrical charge found in the nucleus of all atoms except hydrogen. A neutron has a mass slightly greater than that of a proton.
NUCLEUS OF AN ATOM The central area of the atom. It is composed of two kinds of subatomic particles, protons and neutrons.
VALENCE ELECTRON an electron of an atom, located in the outermost shell (valence shell) of the atom, that can be transferred to or shared with another atom.
ELECTRON CLOUD the group of electrons revolving around the nucleus of an atom; a cloudlike group of electrons
ORBITALS Atomic orbitals are regions of space around the nucleus of an atom where an electron is likely to be found.
ENERGY LEVEL the energy levels of the atoms correspond to the rows of the orbital
SUBATOMIC PARTICLE A unit of matter or energy that's the fundamental makeup of all matter. For example protons and neutrons
ATOMIC MASS The mass of an atom or a molecule
ATOMIC NUMBER The atomic number is equal to the number of protons in an atom's nucleus. The atomic number determines which element an atom is.
Created by: ecarri
 

 



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