Lesson: Counting Subatomic Particles

Determining the number of protons, neutrons, and electrons in atoms.

​Remember:
Neutral Atom or Atom: an atom with no charge. Number of protons is equal to the number of electrons
Ions: an atom wher the number of protons does not equla the number of electrons.

​More electrons are anions .
More Protons are cations

​Isotopes: atoms with same number of protons but diffrerent number of neutrons

Multiple Choice

An element has 5 protons, 6 neutrons, and 5 electrons. What is the mass number?

• 5

• 10

• 11

• 16

Multiple Choice

An element has 5 protons, 6 neutrons, and 7 electrons. What is the charge of the atom?

• +2

• -1

• +1

• -2

Multiple Choice

How many protons are in an average Chlorine atom?

• 17

• 35

• 35.45

• 18

Multiple Choice

How many electrons are in an average Chlorine atom?

• 17

• 35

• 35.45

• 18

Multiple Choice

How many neutrons are in an average Chlorine atom?

• 17

• 35

• 35.45

• 18

Multiple Choice

The chlorine ion represented by the symbol Cl^- has how many protons?

• 17

• 35

• 35.45

• 18

Multiple Choice

The chlorine ion represented by the symbol Cl^- has how many electrons?

• 17

• 35

• 35.45

• 18