Nuclear physics the atom

Nuclear Physics -The atom

subatomic particles & isotopes ​

The Atom

In the nucleus (nucleons)

Proton- (+) charged particle
Neutron- no charge

Outside the nucleus

Electron- (-) charged particle
has almost no mass

Nucleons

• Are particles occupying the nucleus
• Consist of + charged protons and neutral

neutrons

• Have almost 2000 times the mass of

electrons

Match

Match the following

• Proton

• Neutron

• Electron

• Nucleus

• Almost no mass

Positive charge

Neutral charge

Negative charge

Protons & Neutrons

Electron

• Positive charge

• Neutral charge

• Negative charge

• Protons & Neutrons

• Electron

• Where can you find the number of protons?
• It’s the atomic number (found on the periodic

table)

Nuclear Notation

Atomic number = no. of protons

Atomic mass = protons + neutrons

Atomic number is the same as the number of electrons
in an uncharged atom

5
B

10.811

Atomic Number

Atomic Mass

Labelling

label the picture with the following

Drag labels to their correct position on the image

Atomic number

Atomic mass

Drag and Drop

The atomic number is equal to the number of ​

Placeholder

The atomic mass is equal to the number of ​

Placeholder

Drag these tiles and drop them in the correct blank above

protons

protons & neutrons

1a. How many protons?
1b. How many neutrons?
1c. How many nucleons?

You may see atomic number written many ways. The smaller
number is the atomic number and the larger is the atomic
mass

Question 1

Fill in the Blank

Aluminum has ___ protons.

Fill in the Blank

Aluminum has ___ e

Fill in the Blank

Aluminum has ___ neutrons.

• has 13 protons and 14 neutrons for a

total of 27 nucleons

• has 13 protons and 15 neutrons for a

total of 28 nucleons

• The identity of an element depends

on the number of protons

28

Isotopes:

• Atoms of the same element with different

numbers of neutrons (different masses)

Most common
stable isotope
of carbon

Unstable
radioactive isotope
of carbon

Multiple Choice

What is an isotope?

• Atoms with the same number of protons but different number of neutrons.

• Atoms with the same number of protons but different number of electrons.

• Atoms with the same number of neutrons but different number of protons.

• Atoms with the same number of electrons but different number of neutrons.