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Ag	symbol of the chemical element silver.
Al	symbol of the chemical element aluminum.
aluminum	a strong, light, silver metal that does not easily rust. Aluminum is a chemical element. (symbol: Al)
As	symbol of the chemical element arsenic.
aspect	a part or element. [1/4 definitions]
atom	the smallest possible unit of a chemical element. The major parts of atoms contain protons, neutrons, and electrons. They are the basis of all matter in the universe. [1/2 definitions]
Au	symbol of the chemical element gold.
B	symbol of the chemical element boron.
Ba	symbol of the chemical element barium.
barium	a chemical element. Barium is usually found in compounds with other elements. (symbol: Ba)
Be	symbol of the chemical element beryllium.
Br	symbol of the chemical element bromine.
C²	symbol of the chemical element carbon.
Ca	symbol of the chemical element calcium.
carbon	a chemical element found in all living things. Pure carbon occurs as diamond or graphite. It is also often found in compounds with other elements. (symbol: C)
cellulose	the main element of plant tissue, used in making paper, cellophane, and fabrics.
chemical element	Everything in our world and in space is made up of different chemical elements. Things like oxygen, lead, iron, and gold are some of these elements. Chemical elements are the very simple building blocks of all other things. They are pure substances. That means that they are made up of only one type of thing--one type of atom. The element iron, for example, is made up of only atoms of iron. It's not mixed with anything else. The chemical elements do mix with other chemical elements, though. That's how we get things like water, which is made up of two elements: oxygen and hydrogen.
Cl	symbol of the chemical element chlorine
Co	symbol of the chemical element cobalt.
Cr	symbol of the chemical element chromium.
dioxide	a compound containing two atoms of oxygen bound to a single atom of another element.

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