DEMOCRACY
PREP
FIRST AND LAST NAME
SUBJECT
DATE
CLASS/HOMEROOM
UNIT 3 – LESSON 8: Bohr Models
Aim: IWBAT draw Bohr Models for elements from the Periodic Table.
Do Now:
1. Phosphorus (P) is located in group 15 and period 3 on the Periodic Table. It has an atomic number of
15, and an atomic mass of 31.
a. How many protons does phosphorus have?
b. How many neutrons does phosphorus have?
c. How many electrons does phosphorus have?
d. How many valence electrons does phosphorus have?
e. How many electron shells (energy levels) does phosphorus have?
Name: ________________________
Date: _______
EXIT SLIP:
1. In 1-2 complete sentences, explain why electrons cannot be located in a cluster around the nucleus.
Use the Bohr model to the right for questions 2-5.
2. What would be the atomic number of this element?
3. What would be the atomic mass of this element?
4. How many valence electrons does this element have?
5. What is the element (you will need your periodic table)?
6. Draw a Bohr model for Silicon (Si), which has an atomic number of 14 and an atomic mass of 28.
1.
2.
3.
4.
5.
How many protons does it have? _____________
How many neutrons does it have? ____________
How many electrons does it have? ____________
Draw the nucleus.
Place the electrons in energy levels (electron shells).
Name: ________________________
Date: _______
U3.L8 HOMEWORK:
Ms. White: 646-627-0317
Use the Bohr model to the right for questions 1-4.
1. What would be the atomic number of this element?
2. What would be the atomic mass of this element?
3. How many valence electrons does this element have?
4. What is the element (you will need your periodic table)?
Use the Bohr model to the right for questions 5-8.
5. What would be the atomic number of this element?
6. What would be the atomic mass of this element?
7. How many valence electrons does this element have?
8. What is the element (you will need your periodic table)?
Use the information below to answer questions 9-12.
An element is found in the third period of the periodic table and has 4 valence electrons.
9. Draw a Bohr model for this element.
10.
What is its atomic number?
11.
What is its atomic mass?
12.
What is the element (you will need your periodic table)?