Isotopes and Ions
Isotopes


Atoms of the same
element that have
different masses
Have the same
number of protons
and electrons but
different numbers of
neutrons
How many protons, neutrons, &
electrons are in the following?

Bromine – 80

Write the hyphen
notation for the element
that contains 15
electrons and 15
neutrons
 13C
6

35 p, 35 e, 45 n

Phosphorus (P) – 30

6 p, 6 e, 7 n
Ions

An atom or group of bonded atoms that has
a positive or negative charge

Positive ions have lost electrons. They have
more protons than electrons. Ex: Ca2+

Negative ions have gained electrons. They
have more electrons than protons. Ex: N3-
How many protons, neutrons, and
electrons are in the following:

Na+

Cl-

Mg2+

O2-

Al3+

11 p, 12 n, 10 e

17 p, 18 n, 18 e

12 p, 12 n, 10 e

8 p, 8 n, 10 e

13 p, 14 n, 10 e