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Unit 4 - Atomic Structure
Terms in this set (30)
Negatively charged subatomic particle that circles the nucleus of an atom.
atomic mass unit (AMU)
exactly 1/12 the mass of a carbon-12 atom
Positively charged subatomic particle that is a part of the nucleus.
the number of protons in an atom
Neutral subatomic particle that is a part of the nucleus.
The average mass of all the isotopes of an element
Matter that is made up of only one type of atom.
Indicates the number of protons found in an atom of a specific element.
Indicates the number of protons and neutrons found in an atom of a specific element.
atoms of the same element with different numbers of neutrons
Weighted average of the mass numbers of the isotopes of an element.
Symbol for electron
The splitting of an atomic nucleus to release energy.
Creation of energy by joining the nuclei of two hydrogen atoms to form helium.
A spontaneous process in which unstable nuclei lose energy by emitting radiation
Greek philosopher that said all matter is made of tiny particles called "atomos" or atoms
English chemist and physicist who formulated atomic theory and the law of partial pressures
1897- Idea of a subatomic negatively charged particle (electron). Made Plum Pudding model of the atom.
discovered the nucleus
electrons are in energy levels, the further an electron was from the nucleus, the higher its energy -developed the planetary model
electron cloud model
a visual model of the most likely locations for the electrons in an atom
quantum mechanical model
the modern description, primarily mathematical, of the behavior of electrons in atoms
areas within each energy level where electrons move around the nucleus of an atom
Pauli Exclusion Principle
states that a maximum of two electrons can occupy a single atomic orbital but only if the electrons have opposite spins
An electron occupies the lowest-energy orbital that can receive it
electrons occupy orbitals of the same energy in a way that makes the number of electrons with the same spin direction as large as possible
length of time required for half of the radioactive atoms in a sample to decay
a kind of radiation including visible light, radio waves, gamma rays, and X-rays, in which electric and magnetic fields vary simultaneously.
electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength
electrons in the outermost shell
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