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Across
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei
a thing that is composed of two or more separate elements; a mixture
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.
carriers include protons, electrons, quarks, ions
a molecule that can be bonded to other identical molecules to form a polymer.
the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
the strength and vitality required for sustained physical or mental activity
Down
the basic unit of a chemical element
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 stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.
a substance that has a molecular structure consisting chiefly or entirely of a large number of similar units bonded together
the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
a colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air