History of the Atom
Small, negatively charged electrons are embedded in a positive mass.
Thomson's Plum Pudding model
Protons have a _____________ charge.
Positive.
The first energy level (ring) of the electron Cloud, can hold _______ electrons.
2
This is the Mass Number for the element:
Aluminum-27 ion
27
The atom is indivisible. It can combine with other atoms to make new substances.
Dalton's Atom
Electrons are found in this.
Electron Cloud.
These are the two particles that are found in the nucleus of an atom.
Protons and Neutrons.
To calculate the mass number of an atom you would add these two things.
The number of Protons and Neutrons in the nucleus.
Electrons move around the nucleus in an orbit. The energy levels that hold the electrons are set in the amount of energy they have.
Bohr's Nuclear Atom
Neutrons have this kind of charge.
Neutral / no charge.
The second energy level (ring) of the electron Cloud, can hold as many as _______ electrons.
8
What is the charge of an ion that has 2 Protons and 4 Electrons?
(you must say the type of charge AND the number)
2 -
A ray in the cathode ray tube bent toward the positive plate indicating that the ray was made of negative charges.
Rutherford's Nuclear Atom
The number of protons in an atom can be found using this.
the Atomic Number.
This contains most of the mass of the Atom.
the Nucleus.
For the Isotope, Carbon-14.......It has 8 Neutrons.
Therefore, how many Protons does it have?
6
By shooting alpha particles through gold foil, experimenters determined that the nucleus is tiny compared to the total volume of the atom.
Rutherford's Nuclear Atom
Different isotopes of the same element have different........what?
Protons.
A sample of helium is 1% helium-3 and 99% helium-4.
What is the Average Mass of this sample?
approximately = 3.99
A diamond contains 98.4% carbon-12 and 1.6% carbon-13.
What is the Average Mass of this sample?
approximately = 12.02