Atoms-Calculating sub-atomic particles

Atoms-Calculating sub-atomic particles

Multiple Choice

Which element has the symbol C in the periodic table?

• Carbon

• Calcium

Multiple Choice

Which element has the symbol He in the periodic table?

• Hydrogen

• Helium

Multiple Choice

Which element has the symbol He in the periodic table?

• Hydrogen

• Helium

Multiple Choice

Which element has the symbol B in the periodic table?

• Boron

• Beryllium

Multiple Choice

Which element has the symbol K in the periodic table?

• Krypton

• Potassium

Multiple Choice

Which element has the symbol O in the periodic table?

• Neon

• Oxygen

Open Ended

What are the 3 types of sub-atomic particles found in an atom?

Atoms have 3 types of sub-atomic particles

• Protons

• Neutrons

• Electrons

How do we find the number of sub-atomic particles for an element in the periodic table?

First: We have to identify the atomic number and atomic mass of the element.

Finding the number of protons

The number of protons is equal to the Atomic number of the element.

Example: the number of protons for oxygen is 8 which is the same as the atomic number.

Finding the number of electrons

The number of electrons is equal to the number of protons of the element.

Example: the number of electrons for oxygen is 8 which is the same as number of protons.

Finding the number of neutrons

The number of neutrons are found by subtracting the atomic number from the atomic mass (rounded off).

Finding the number of neutorns

The number of neutrons are found by subtracting the atomic number from the atomic mass (rounded off).

Example: The number of neutrons for oxygen is

N = m - n

N = 16 - 8

N= 8 neutrons

Can you find the number of protons, neutrons and electron for this element?

Step: 1

Find the atomic number.

The atomic number = the number of protons

Number of protons = 6

Step: 2

The protons (same as atomic number) = the number of electrons

Number of electrons = 6

Step: 2

Find the atomic mass. This is the number below the symbol.

Round it off to a whole number.

12.011 = 12

atomic mass = 12

Step: 3

Find the number of neutrons.

Subtract the atomic number (same as protons) from the atomic mass.

N = m - n

N = 12 - 6

N = 6 neutrons

TASK

• Create a table with the names and symbols of the first 20 elements of the periodic table.

• In your table include the number of protons, electrons and neutron of each element.

• Upload a copy or picture of your table to google classrooms.