4.2 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
a subatomic particle that has no charge and that is found in the nucleus of an atom
A
nuetron
4
Q
the number of protons in the nucleus of atom ; the atomic number is the same for all atoms of an element
A
atomic number
5
Q
an atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons
A
isotope
6
Q
the sum of the numbers of protons and neutrons in the nucleus of an atom
A
mass number
7
Q
the mass of an atom expressed in atomic mass units
A
atomic mass
