Chapter 2-1 The Nature Of Matter

Front 1

Atom

Back 1

basic unit of matter

Front 2

nucleus

Back 2

the center of the atom where strong forces bind protons and neutrons together

Front 3

electron

Back 3

a negatively charged particle; 1/1840 the mass of a protron; they are in constant motion; they are attracted to the positively charged nucleus but remain outside the nucleus because of the energy of their motion

Front 4

element

Back 4

a pure substance that consists entirely of one type of atom

Front 5

isotopes

Back 5

atom of an element that has a number of neutrons different from that of other atoms of the same element

Front 6

compound

Back 6

a substance formed by the chemical combination of 2 or more elements in definite proportions

Front 7

ionic bond

Back 7

formed when one or more electrons are transferred from one to another

Front 8

ion

Back 8

positively and negatively charged atoms

Front 9

covalent bond

Back 9

formed when electrons are shared between atoms

Front 10

molecule

Back 10

the smallest unit of most compounds

Front 11

van der Waals forces

Back 11

intermolecular forces of attraction; when molecules are close together, a slight attraction can develop between the oppositely charged regions of nearby molecules; are not as strong as ionic bonds or covalent bonds