Atoms Flashcards
1
Q
the smallest unit of an element that still maintains the property of an element
A
atom
2
Q
a subatomic particle with negative charge
A
electon
3
Q
the atoms central region
A
nucleus
4
Q
a region around the nucleus of an atom where electrons are likely to be found
A
electron cloud
5
Q
a subatomic particle that has a positive charge
A
proton
6
Q
a unit of mass that describes the mass of an atom or molecule
A
atomic mass unit
7
Q
a subatomic particle with no charge
A
neutron
8
Q
the number of protons in the nucleus of an atom
A
atomic number
9
Q
an atom that has the same number of protons but not neutrons
A
isotope
10
Q
the sum of the numbers of protons and neutrons in the nucleus of an atom
A
mass number
11
Q
the mass of an atom expressed in atomic mass units
A
atomic mass
