section 2 The Atom Flashcards
1
Q
a subatomic particle that has a positive charge and that is found in the nucleus of an atom
A
proton
2
Q
a unit of mass that describes the mass of an atom or molecule
A
atomic mass unit
3
Q
the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element
A
atomic number
4
Q
an atom that has the same number of protons as other atoms the same element but that has a diferent number of neutrons
A
isotope
5
Q
the mass of an atom expressed in aatooomic mass units (amu)
A
atomic mass
6
Q
a subatomic particle that has no charge that is found in the nucleus of an atom
A
neutron
7
Q
the sum of the numbers of protons and neutrons in the nuclues of an atom
A
mass number
