Atoms and the Periodic Table
Nitrogen Atom
Use the model of a nitrogen atom
to answer the following questions;
 How many protons does Nitrogen
have? ________________
 How many neutrons? ___________
 What is the atomic number of
Nitrogen? ______________
 What is the atomic mass of
Nitrogen? ________________
The Periodic Table is arranged in a logical way to provide information (like what you see
above) about all of the elements.
Atomic number (protons)
Symbol
Element
Atomic Mass (protons and neutrons)
7
N
Nitrogen
14.01
How can we find the number of neutrons and electrons?
 Electrons must equal the number of protons if the element is neutral
( +’s equal -’s ).
 The atomic mass minus the atomic number is equal to the number of neutrons
Let’s practice!
ELEMENT
SULFUR
atomic #
mass #
26
56
16
32
# of protons
6
20
9
40
14
COPPER
SILVER
7
29
35
23
MERCURY
# of electrons
6
19
CALCIUM
# of neutrons
11
201
80
61
47