The Atom
Doing the Math
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
Hydrogen
1
Helium
Number Number
of
of
Neutrons Electrons
0
4
6
Nitrogen
Oxygen
2
4
4
9
6
7
14
8
16
Fluorine
Sodium
Mass
Number
(amu)
1
2
Beryllium
Carbon
Atomic
Number
9
12
19
23
Atomic Structure
(Bohr’s Model)
Use the information provided for each element to complete the
diagrams.
Draw the electrons in their proper shells:
Place the correct numbers in the nucleus to indicate the number of
protons and the number of neutrons.
Shell
#
1
2
3
4
5
Max # of
Electrons
2
8
18
32
50
1. Sulfur: atomic number 16
atomic mass
32
2. Beryllium: atomic number 4
atomic mass
9
3. Nitrogen: atomic number 7
atomic mass 14
4. Sodium: atomic number 11
atomic mass 23