chemistry vocab Flashcards
proton
the positive charge within the nucleus
atomic mass
the number of protons plus the number of neutrons make this number
atomic number
the number of protons alone make this number
lewis structure
a structure that shows number of electrons in the outer shell
bohr model
a model that shows the nucleus surrounded by shells
covalent bond
the attraction that forms between atoms when they shares electrons
ion
atoms that have a charge
element symbol
a symbol that represents the element
mendeleev
a russian chemist who made the periodic table we know today
periodic table
the table that shows all the elements
valence electrons
electrons in the outer shell
electrons shells
shells in the atom that hole electrons
ionic bonds
the force of attraction between opposite charges of ions
element
a substance consisting of atoms which all have the same number of protons
isotope
when an element has more a different number of neutrons then protons
