1.2 Isotopes

atoms that have the same number of protons, but different numbers of neutrons

Example: C-12 has 6 protons and 6 neutrons ; C-14 has 6 protons and 8 neutrons. Both are carbon and act chemically the same (same chemical properties because neutrons do not affect charge of the nucleus)

C-12 has a nuclear charge of 6+

C-14 has a nuclear charge of 6+

Isotopes differ in mass, but not nuclear charge (same Atomic Number)

Can be rearranged based on the question...

protons = Mass Number - neutrons

neutrons = Mass Number - protons

atoms with same # protons , different # of neutrons

Atoms of the same element can have slightly different masses, but behave chemically the same way.

Named as "element-mass #" (Ex: nitrogen-15)

Shorthand is "chemical symbol-mass #" (Ex: N-15)