Atoms
Word Wall
WW: Atoms
1.
2.
3.
4.
5.
6.
7.
8.
Element
Atom
Nucleus
Proton
Electron
Neutron
Atomic number
Atomic mass
WW: Atoms
Copy into your notebook or on a
piece of paper
Vocab
Definition
Picture
WW: Atoms
1. Element: any of more than 100
known substances that cannot be
separated into simpler substances;
has unique atomic number
WW: Atoms
2. Atom: the smallest, indivisible
particles of matter; 3 parts –
protons, electrons, neutrons
WW: Atoms
3. Nucleus: the center of the atom;
made up of protons and neutrons;
positively charged
WW: Atoms
4. Proton: positively charged
particle, located in the nucleus; the
number of protons makes an
element UNIQUE
WW: Atoms
5. Electron: negatively charged
particle, located in the electron
orbitals
WW: Atoms
6. Neutron: neutral charged
particle, located in the nucleus
WW: Atoms
7. Atomic Number: the number of
protons and/or electrons in an
element
WW: Atoms
8. Atomic Mass: The sum of protons
and neutrons in an element; the
mass of the atom
WW: Atoms
9. Atomic theory
10. Bohr diagram
11. Electron orbital (shell)
12. Valence shell
13. Valence electron
WW: Atoms
Copy into your notebook or on a
piece of paper
Vocab
Definition
Picture
WW: Atoms
9. Atomic Theory: A theory formed
by John Dalton that all matter is
made up of tiny indivisible particles
(atoms)
WW: Atoms
10. Bohr Diagram: A diagram that
shows how many electrons are in an
atom and their arrangement
WW: Atoms
11. Electron orbital (shell): Circlelike regions around the nucleus (in
an atom) where electrons are
usually found
WW: Atoms
12. Valence shell: The outermost
electron shell of the Bohr diagram
or an atom
WW: Atoms
13. Valence electron: the number of
electrons in the outermost shell; only
the valence electrons react with
other atoms; corresponds to the
GROUP number
Vocabulary Flashcards
Make flashcards to help review your
vocabulary:
• On the blank side – write the word
•
(add pictures to help you remember!)
• On the lined side – write the
definition
Keep these with you at ALL times and
keep adding words!