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11 Cards in this Set

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atom
The basic unit of matter. The Greek word "atomos", which means "unable to be cut".
nucleus
The center of the atom, protons and neutrons tightly bound together.
electron
A negatively charged particle. They are in constant motion in the space surrounding the nucleus.
element
A pure substance that consists entirely of one type of atom. More than 100 elements are known. Also called chemical elements.
isotope
Atoms of the same element that differ in the number of neutrons they contain. Ex. some carbon atoms have 6 neutrons, some have 7 or 8.
compound
A substance formed by the chemical combination of two or more elements in definite proportions. Shown using a kind of shorthand known as a chemical formula.
ionic bond
Formed when one or more electrons are transferred from one atom to another.
ion
An atom that gains or loses electrons. Atoms are neutral because they have equal numbers of protons and electrons. When they lose an electron, it has a positive charge. When it gains electrons, it has a negative charge. These are called ions.
covalent bond
Forms when electrons are shared between atoms. They can form single, double and even triple bonds.
molecule
The smallest unit of most compounds
van der Waals forces
Intermolecular forces of attraction between molecules. When molecules are close together, a slight attraction can develop between the oppositely charged regions of nearby molecules.