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Atomic Structure and the Periodic Table

Across
a thing that is composed of two or more separate elements
the action or process of filtering something.
the number of protons in the nucleus of an atom
form or cause to form crystals.
each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter.
the total number of protons and neutrons in a nucleus
the mass of an atom of a chemical element expressed in atomic mass units
an element or substance that is not a metal.
a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
A substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions
a substance made by mixing other substances together.
the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
Down
The basic unit of a element
The mixture is dissolved in a fluid called the mobile phase, which carries it through a structure holding another material called the stationary phase.
the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
the action of purifying a liquid by a process of heating and cooling
The periodic table of the chemical elements
a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
a colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air
a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.