Science Chapter 2 Vocabulary

smallest piece of an element that still represents that element

• electron

• proton

• atom

• neutron

a particle with one negative charge (1-)

• proton

• neutron

• atom

• electron

the small area in the center of the atom where most of an atom's mass and charge is located

• nucleus

• neutron

• electron cloud

• proton

an atomic particle that has a positive charge (1+)

• electron

• proton

• neutron

• ion

a neutral particle that exists in the nucleus of an atom

• proton

• neutron

• isotope

• electron

an area around the nucleus where an electron is most likely to be located

• ion

• isotope

• atomic number

• electron cloud

the number of protons in an atom of an element

• mass number

• average atomic mass

• atomic number

• ion

atom of the same element that have different number of neutrons

• isotope

• ion

• electron

• nucleus

the sum of the number of protons and neutrons in an atom

• atomic number

• radioactive

• average atomic mass

• mass number

the average mass of an element's isotopes, weighted according to the abundance of each isotope

• nuclear decay

• average atomic mass

• mass number

• atomic number