Historical Atomic Models
The first to theorize a small indivisible particle called "atoms"
Who is Democritus?
The dense center of the atom.
What is the nucleus?
The smallest unit of an element that retains the properties of that element.
What is ATOM?
Carbon-12 contains 6 protons and ________ neutrons.
6.
Group 18.
What are NOBLE GASES?
Discovered the electron. Model named the "plum pudding model.
Who is J.J. Thomson?
Subatomic particles with a positive charge.
What are protons?
The number of protons in an atom's nucleus.
What is ATOMIC NUMBER?
Carbon-13 contains 6 protons and __________ neutrons.
7.
Group 1.
What are ALKALI METALS?
Proposed that electrons occupy specific energy levels around the nucleus.
Who is Niels Bhor?
Subatomic particles with a negative charge.
What are electrons?
The region surrounding the nucleus where electrons are likely to be found.
What is ELECTRON CLOUD/ORBITAL?
Calcium-36 contains 20 protons and __________ neutrons.
16.
Group 17.
What are HALOGENS?
Used the gold foil experiment to study atoms. Discovered that atoms have a small, dense, positively charged nucleus.
Who is Ernest Rutherford?
Subatomic particles with no charge.
What are neutrons?
The total number of protons and neutrons in one atom.
What is MASS NUMBER?
Oxygen-16 contains 8 protons and ___________ neutrons.
8.
Group 2.
What are ALKALI EARTH METALS?
Developed the quantum-mechanical model. (Two Names)
Who is Erwin Schrödinger and Werner Heisenberg?
Where electrons found.
What are orbitals?
The weighted average mass of an element's naturally occurring isotopes, usually shown on the periodic table.
What is ATOMIC MASS?
A common copper isotope contains 26 protons and 30 neutrons. It is called _________________.
What is copper-56?
This family contains only one element.
What is the HYDROGEN FAMILY?