Up and atom Flashcards
Atom
Smallest unit of an element retaining properties.
Proton
Positively charged subatomic particle in nucleus.
Neutron
Neutral subatomic particle in nucleus.
Electron
Negatively charged subatomic particle in orbits.
Atomic Number
Number of protons in an atom’s nucleus.
Mass Number
Sum of protons and neutrons in nucleus.
Nucleus
Central part of an atom containing protons and neutrons.
Electron Configuration
Arrangement of electrons in an atom’s shells.
Ion
Atom with a net positive or negative charge.
Cation
Positively charged ion from losing electrons.
Anion
Negatively charged ion from gaining electrons.
Full Octet
Stable electron configuration with eight electrons.
Periodic Table
Organized chart of elements by atomic structure.
Subatomic Particles
Particles smaller than an atom: protons, neutrons, electrons.
Natural Radioactivity
Decay of atomic nuclei releasing energy.
Shells
Orbits around nucleus where electrons reside.
Element
Substance made of identical atoms with unique properties.
Experimental Evidence
Data supporting the development of atomic models.
Proton Number
Determines the identity of an element.
Particle Model
Explains behavior and arrangement of matter states.
Electron Loss
Process where an atom loses electrons to become a cation.
Electron Gain
Process where an atom gains electrons to become an anion.
Atomic Model
Representation of atomic structure developed over time.
Capacity of Shells
Maximum electrons each shell can hold.
