1. Review Give me your best explanation of what an ion is.
What is an isotope?
An ion has a different number of electrons. A positively charged ion will have less electrons that protons, and a negatively charged ion will have more electrons than protons. You CAN CHANGE the number of electrons. BUT if you change the number of protons you aren’t talking about the same element anymore.
An isotope is the same element with different numbers of neutrons. An example of this would be Carbon-12 and Carbon-14. These are both still carbon and thus have 6 electrons and 6 protons, but the mass number of carbon-14 is larger than carbon-12 meaning it has 8 neutrons instead of 6.

2. Let’s Think
How do you think electrons move around the nucleus?

3. Bohr’s model…
Electrons are found in specific circular paths (orbits) around the nucleus.
The electrons have fixed energies called energy levels. (like rungs on a ladder)
The amount of energy required to move an electron to another energy level is called a quantum.

4. The Quantum Mechanical model
It is based on the energy and possible location of an electron.
how likely it is to find an electron is described in terms of probability. (ie. Propeller blades)
Based on work done by Shrodinger…

7. Bohr's Model of the Atom
Bohr's model:
-electrons orbit the nucleus like planets orbit the sun

8. Bohr's Model of the Atom
Bohr's model:
-electrons orbit the nucleus like planets orbit the sun
-each orbit can hold a specific maximum number of electrons

9. Bohr's Model of the Atom
Bohr's model:
-electrons orbit the nucleus like planets orbit the sun
-each orbit can hold a specific maximum number of electrons
orbit
maximum # electrons 1 2 8 3 4 18

10. Bohr's Model of the Atom
Bohr's model:
-electrons orbit the nucleus like planets orbit the sun
-each orbit can hold a specific maximum number of electrons
-electrons fill orbits closest to the nucleus first.

11. Bohr's Model of the Atom
try these:
hydrogen
boron
magnesium

12. Bohr's Model of the Atom
try these:
hydrogen 1P 0N

13. Bohr's Model of the Atom
try these:
boron 5P 6N

14. Bohr's Model of the Atom
try these:
magnesium
12P
12N