J.J Thompson discovered…
the electron
What was J.J Thompson’s model named?
Plum Pudding Model
What are alpha particles?
positively charged ions with a mass of about 7300 electrons
How was J.J Thompson’s model neutrally charged?
the electrons were embedded in a positively charged substance
What did Rutherford discover?
the nucleus and that the majority of the atom consists of empty space
What is atomic number?
the number of protons in the nucleus
What are neutrons?
neutral particles inside the nucleus
What do the protons do?
determine the identity
What is the ground state?
the atom’s lowest energy level
What is the excited state?
the atom’s highest energy level
What was Bohr’s model?
The Planetary Model
Waves can behave like __________, the particles can behave like ________.
particles, waves
An electron is both a…
wave and a particle
What is the Heisenberg uncertainty principle?
that it is impossible to know both the energy or momentum and the exact position of an electron at the same time
What are orbitials?
three-dimensional regions of probable position
What does n stand for?
principle energy level
What are the sublevels?
s, p, d, and f
Each orbital has __ max electrons.
2
s sublevel
1 orbital, 2 max electrons
p sublevel
3 orbital, 6 max electrons
d sublevel
5 orbital, 10 max electrons
f sublevel
7 orbital, 14 max electrons
What is a Isotope?
atom with the same number of protons but a different number of electrons
What is a mass number?
a number equals to the sum of the number of protons and neutrons in the nucleus of an atom
