Play
Atomic Structure and Theory Terms

Atomic Structure and Theory Terms

Mastery: 0%
Click on any card to view the other side. To master this BrainRush, click Play.
Tags: science   ela   chemistry   rst.9-10.4   rst.11-12.4   high school   hs-ps1-2   ngss   ps1-2   terms   atom   structure   atomic   theory  

Share This BrainRush:

Atom
back
The smallest object that retains properties of an element. Composed of electrons and a nucleus (which contains protons and neutrons).
front
Dalton's Atomic Theory
back
A set of ideas that laid the foundation for the modern atomic model.
front
Electrons
back
Negatively-charged subatomic particles which reside in the space around the nucleus. They have very small masses.
front
Cathode Ray
back
A beam of electrons emitted from the cathode of a high-vacuum tube. It was used to prove the existence of electrons.
front
Protons
back
Positively-charged subatomic particles present in the nucleus of an atom. Their masses are about equal to a neutron's mass and are much greater than an electron's mass.
front
Neutron
back
Neutral subatomic particles present in the nucleus of an atom. Their masses are about equal to a proton's mass and are much greater than an electron's mass.
front
Nucleus
back
The center of an atom. It is composed of neutrons and protons.
front
Atomic Number
back
This value defines an element - it is the number of protons in the nucleus of the atom.
front
Mass Number
back
A value which equals the number of protons plus the number of neutrons in the nucleus.
front
Isotopes
back
Atoms which share the same number of protons, but have a different number of neutrons (and thus a different mass number as well).
front
Atomic Mass Unit (amu)
back
Equal to 1/12th the mass of a Carbon-12 atom.
front
Atomic Mass
back
The mass of an atom of an element (expressed in amu). It is equivalent to the weighted average mass number of all naturally occurring isotopes of an element.
front
Periodic Table
back
A table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure appear in vertical columns.
front
Period
back
A horizontal row on the periodic table that consists of elements who share the same principal quantum number but not any chemical properties.
front
Group
back
A vertical column in the periodic table that consists of atoms who share the same number of valence electrons (and thus chemical properties as well).
front
Valence Electrons
back
The outermost electrons in an atom - they are responsible for an atom's reactivity and identifying traits.
front
Nucleons
back
The subatomic particles present in the nucleus (both protons and neutrons are in this category).
front