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2.1 Biology vocab

Across
Negatively charged particle with only 1/1840 the mass of a proton
The structure that results when atoms are joined together by covalent bonds
Intermolecule forces of attraction
One or more electrons are transferred from one atom to another
An atom that gains electrons has a negative charge
Strong forces bind together to form this
Down
Pure substance that consists entirely of one type of atom
Substance formed by the chemical combination of two or more elements in definite proportion
Moving electrons actually travel about the nuclei of both atoms forming this.
The basic unit of matter
Atoms of the same element that differ in the number of neutrons they contain are known as this.