Unit 3 Lesson 1
Name ______________________________________ Date _________
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The Atom
Doing the Math
Work with an adult to complete the missing information in the table below. Use the
information provided in the Data Bank to help decide how to do the math needed to fill in the
missing information.
Data Bank
• Protons are positively charged particles in the nucleus. The number of protons in
the nucleus determines the atomic number of an element.
• Neutrons are neutral particles located in the nucleus. The total number of
protons and neutrons in an atom provides the mass number of the atom.
• Electrons are negatively charged particles located outside the nucleus in the
electron cloud. A neutral atom has equal numbers of protons and electrons.
1. Use the information above to do the math needed to complete the table.
Vital Statistics for Common Elements
Element
Number of
Protons
Number of
Neutrons
Hydrogen
1
0
Helium
4
6
Nitrogen
Oxygen
Atomic Number
2
4
4
9
6
7
14
8
16
Fluorine
Sodium
Mass Number
(amu)
1
2
Beryllium
Carbon
Number of
Electrons
9
12
19
23
2. Chose any element from the table. Make a drawing of the element’s atom in the space below. Show the
location of the electron cloud, perhaps by shading. Label the parts of your drawing. Identify the number
of electrons that make up the electron cloud.
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