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Chapter 3 Vocab S
Earth Science Vocab from our 9th grade Text Book.
a substance that cannot be changed , a substance that cannot be separated or broken down into simpler substances by chemical means
smallest particle of an element
control center of the cell
positively charged particle
the number of protons in the nucleus of an atom
the sum of the number of neutrons and protons in an atomic nucleus
negatively charged particle
place in an atom where an electron is most likely to be found
an electron in the outermost electron shell
atoms of the same element that have different masses
total mass of the protons and neutrons in an atom, measured in atomic mass units
the process by which an unstable nucleus emits one or more particles or energy in the form of electromagnetic radiation
(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
the attractive force that holds atoms or ions together
a bond formed when atoms share one or more pairs of electrons
two or more atoms held together by covalent bonds
atom that has a positive or negative charge
bond formed when one or more electrons are transferred from one atom to another