Isotopes, Protons, Nuetrons, Electrons

Isotope

Atoms with the same number of protons, but different numbers of neutrons.

7

Mass number

3

atomic number

protons plus neutrons

mass number of an isotope

charge = protons - electrons

how to find atom charge

mass number - protons

number of neutrons in an isotopes

atomic number of element

protons in an isotope

neutrons

no charge, found in nucleus

protons

positive charge, found in nucleus

electrons

Negative charge outside the nucleus that can move

Atom

the smallest particle of an element that retains its identity in a chemical reaction

nucleus

the center of an atom, which contains the protons and neutrons; in cells, structure that contains the cell's genetic material in the form of DNA

quark

particle of matter that makes up protons and neutrons

electron cloud

area around the nucleus of an atom where the atom's electrons are most likely to be found

mass number

the total number of protons and neutrons in the nucleus of an atom

periodic table

A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together.

period

A horizontal row of elements in the periodic table

Group

a vertical column of elements in the periodic table

electron dot diagram

a model that represents valence electrons in an atom as dots around the element's chemical symbol