Question

bohr model practice
name______________________ date______ period ____
directions: use a periodic table to draw a bohr model of the following atoms.
hydrogen
atomic number
atomic mass
number of protons
number of electrons
number of neutrons
p =
n =
helium
atomic number
atomic mass
number of protons
number of electrons
number of neutrons
p =
n =

Explanation:

Step1: Find Hydrogen's atomic data

From periodic table:
Atomic Number = 1
Atomic Mass = 1.008 ≈ 1
Protons = Atomic Number = 1
Electrons = Protons = 1
Neutrons = Atomic Mass - Protons = $1 - 1 = 0$

Step2: Find Helium's atomic data

From periodic table:
Atomic Number = 2
Atomic Mass = 4.003 ≈ 4
Protons = Atomic Number = 2
Electrons = Protons = 2
Neutrons = Atomic Mass - Protons = $4 - 2 = 2$

Step3: Summarize Bohr model details

Hydrogen: 1 proton, 0 neutrons in nucleus; 1 electron in 1st energy level.
Helium: 2 protons, 2 neutrons in nucleus; 2 electrons in 1st energy level.

Answer:

Hydrogen

Property	Value	Bohr Model Details
Atomic Mass	1.008
Number of Protons	1
Number of Electrons	1
Number of Neutrons	0

Helium

Property	Value	Bohr Model Details
Atomic Mass	4.003
Number of Protons	2
Number of Electrons	2
Number of Neutrons	2