Atomic Theory Flashcards
1
Q
Nucleus
A
central part of an atom, made up of protons and neutrons; roundish structure inside a cell that acts as the control centre for the cell. Plural = nuclei.
2
Q
Protons
A
positively charged particles found in the nucleus of an atom
3
Q
Neutrons
A
Particles that have no electric charge
4
Q
Electrons
A
negatively charged, very light particles in an atom. Electrons move around the nucleus of the atom.
5
Q
Isotope
A
Same element, different atomic mass
6
Q
Stable
A
describes a nucleus that does not change spontaneously. The protons and neutrons in the nucleus are held together strongly.
7
Q
Unstable
A
describes an atom in which the neutrons and protons in the nucleus are not held together strongly
8
Q
Radioisotope
A
a radioactive form of an isotope
