Electron Review Worksheet
Jeffrey Huang Ajey Gangwani
Key Terms:
Electrons: Smallest subatomic particle with a negative charge, Has a very small mass
and is located outside of the nucleus
Protons: Subatomic particle with a positive charge. Located in the nucleus.
Neutrons: Subatomic particle with a neutral charge. Located in the nucleus
Valence Electrons: Electrons located in the outer energy level and are involved in
chemical reactions with other atoms
Orbitals: Orbital: Region of space electrons occupy. Four types of orbitals, S,P,D,F
Ion: Atom or group of atoms with a positive or negative charge
Cation: Ion with a positive charge
Anion: Ion was a negative charge
Lewis Structures: Representation of covalent bonding using Lewis symbols with dots
and lines
JJ Thompson: Cathode Ray Experiment. Discovered the Electron
Robert A. Milkan: Oil Drop Experiment. Determined exact charge of an a electron
Niels Bohr-Developed a new diagram of the atom. Discovered energy Levels
Find the amount of electrons in these elements:
1. Li
2. Xe
3. As
Find the amount of electrons in these ions:
1. F–
2. Al3+
3. Sr2+
Find the number of valence electrons in these elements:
1. Cs
2. Ga
3. Sb
4. Br
5. Ne
Determine the maximum number of electrons that can be found in each of the
following subshells:
1. 2s
2. 4D
3. 5F
4. 3D
5. 3P
Write our the electron configuration of Boron. How many unpaired electrons does
it have?
Write out the election configuration of Antimony? How many unpaired electrons
does it have
Which Element has the following electron configuration: 1s2 2s2 2p6 3s2 3p5?
Which Element has the following electron configuration: [Ar] 4s2 3d10 4p1
Draw the Lewis Structure of the following compounds:
1. Cl2
2. CH4
Answer Key:
1. 3
2. 54
3. 33
1. 10
2. 10
3. 36
1. 1
2. 3
3. 5
4. 7
5. 8
1. 2
2. 10
3. 14
4. 10
5. 6
1. 1s2 2s2 2p1 or [He] 2s2 2p1. One unpaired electron
2. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p3 or [Kr] 5s2 4d10 5p3. Three
unpaired electrons
3. Chlorine
4. Indium
1.
2.