Science 8th Periodic Table

Question Answer
atom smallest particle of an element made up of protons
proton a particle with a positive charge that is found in the nucleus of an atom
neutron a particle with no charge that is found in the nucleus of an atom
electron a particle with a negative charge that is found outside the nucleus of an atom
valence electron an electron in the outer shell of an atom which can combine with other atoms to form molecules
shell the path an electron takes as it circles the nucleus of an atom
electron cloud a region around the nucleus of an atom where electrons are likely to be found
ion an atom that has a positive or negative charge
isotope one of two or more atoms with the same atomic number (protons) but with different numbers of neutrons
ionic bond a chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion
covalent bond a chemical bond that involves sharing a pair of electrons between atoms in a molecule
atomic mass the average mass of all the isotopes of an element
atomic number the number of protons in the nucleus of an atom
mass number the total number of protons and neutrons in the nucleus of an atom
element matter that consists entirely of one type of atom
compound matter whose smallest unit is a molecule made up of more than one kind of atom

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