Chapter 11 Vocab

A positively charged particle found in an atom

• nuetron

• proton

• electron

• nucleus

A proton is found in

• The nucleus of an atom

• the orbitals of an atom

• An isotope

• electron clouds

An atom with the same number of protons and neutrons is called

• A neutral atom

• An isotope

• An ion

An atom with the same number of protons but different numbers of neutrons is called

• A neutral atom

• An isotope

• An ion

The region in an atom that contains most of the mass is

• The nucleus

• The electron clouds

• the protons

• the mitochondria

Mass Number =

• Number of protons in an atom

• Number of protons + neutrons in an atom

• Number of electrons + protons in an atom

• The weighted average of all the naturally occurring isotopes of an element is called the

Atomic Number =

• Number of protons in an atom

• Number of protons + neutrons in an atom

• Number of electrons + protons in an atom

• The weighted average of all the naturally occurring isotopes of an element is called the

Atomic Mass =

• Number of protons in an atom

• Number of protons + neutrons in an atom

• Number of electrons + protons in an atom

• The weighted average of all the naturally occurring isotopes of an element is called the

An atom is

• HUGE

• The smallest particle into which an element can be divided and still be the same

  substance

• The smallest particle into which an element can be divided

• an isotope

electrons were discovered by

• JJ Rutherford

• Ernest Thompson

• JJ Thompson

• John Dalton