History of the Atom / Atomic Theory & Electron Arrangement / Periodic Table
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a substance that cannot be divided into simpler substances by chemical means
formed when atoms from two or more elements are chemically combined
two or more substances are mingled together but not chemically combined
a charged atom or group of atoms
the number of protons in the nucleus of an atom of that element
the sum of the numbers of protons and neutrons in the nucleus of the atom of that element
atoms of the same element (i.e. the same atomic number)that have different mass numbers due to the different number of neutrons in the nucleus
Relative Atomic Mass
the average mass numbers of the isotopes of an element taking their abundances into account and compared to one-twelfth of the carbon -12 isotope
the fixed energy value that an electron in a n atom may have
group atomic orbitals that all hav the same energy
region in space in which there is a high probability of finding an electron
Heisenberg's Uncertainty Principle
It is impossible to measure at the same time both the velocity and the position of an electron
Dalton's Atomic Theory
- All matter is made up of very small particles called atoms.
- All atoms are indivisible.
- They cannot be broken down into simpler particles.
- Elements identical to each other will have the same atomic mass.
streams of negatively charged particles called electrons
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