Atoms Flashcards
An atom is the smallest part of a chemical element that can exist.
Atom
Protons: Positively charged subatomic particles that reside in the nucleus.
Neutrons: Neutrally charged subatomic particles that reside in the nucleus.
Electrons: Negatively charged subatomic particles found in the electron shells surrounding the nucleus.
Protons Neutrons And Electrons
A particle which is smaller than an atom in size
Subatomic particle
An electron in the outer shell associated with an atom
Valence Electron
The number of protons in the nucleus of an atom
8 <= O Oxygen
Atomic Number
The number of protons and neutrons in the atom
8 O Oxygen 15.999 <=
Atomic Mass
Two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei
Isotope
The percentage of atoms with a specific atomic mass found in a naturally occurring sample of an element
(x) + (100-x) = 100
Percent Abundance
When an atom has an equal number of electrons and protons, it has an equal number of negative (the electrons) and positive electric charges (the protons
Neutral Atom
Is a charged atom or molecule
Ion
Ions that are negatively charged
Anion
A positively charged ion
Cation
Are nuclides that are not radioactive
Generally have even numbers of both protons and neutrons and a neutron-to-proton ratio of at least 1
Stable Nucleus
The Solar System Atom Model
Neil Bohr & Bohr model
Pudding model (neutrons and protons in one ball)
J.J. Thomson & Plum pudding
