4.1
Atomos means
Uncut
Name any of the 3 scientists in 4.1
John Dalton
JJ. Thomson
Ernest Rutherford
Name the 3 subatomic particles
Protons
neutrons
electrons
Where are electrons located?
a) in the nucleus
b) far outside nucleus
c) both locations
B) far outside the nucleus
The energy level with the least energy has
One orbital
This scientist first explained that compounds have fixed compositions
John Dalton
Rutherford was able to determine that the positive particles are located in the _____ of the atom
Nucleus
Name the 3 subatomic particles and their charges
Protons: positive
neutrons: neutral
electrons: negative
protons & electrons
neutrons
The max number of electrons that can be in the first orbital is
2
Dalton's model of the atom was
a. Beach Balls
b. Wooden Spheres
c. Clouds
b. Wooden Spheres
Rutherford discovered ______ particles. Fast moving particles that have a positive charge.
Alpha
Each atom has a unique set of. It is their atomic number
protons
_____ developed a model of electrons in fixed orbits
Niels Bohr
Vocab: _______ _______
The arrangement of electrons in the orbitals of an atom.
Electron configuration
Thompson used _________ to find out to test atoms.
(What was used in his experiment?)
electric current
Rutherford shot particles into ____ _____ to see how they reflected.
gold foil
The _____ and _____ make up the atomic mass
protons and neutrons
The different energies that electrons have are called _____ _____
energy levels
The most stable electron configuration occurs when electrons are in..
lowest orbitals/lowest possible energies
Thompson proved the existence of...
subatomic particles
The nucleus is described as...
a dense, positively charged mass in the center of the atom
Electrons are very very small. It would take about ______(a number) electrons to equal the mass of just 1 proton.
2000
If an electron gains energy, it can...
move to a higher energy level
When all electrons in an atom have the lowest possible energies, the atom is in its
ground state