Understanding Atomic Numbers and Elements

The video tutorial explains how to identify elements using the atomic number, which equals the number of protons. The atomic number is found above the element symbol on the periodic table. For example, helium has an atomic number of two, indicating it has two protons. The atomic number is sometimes referred to as the proton number. Each element has a unique atomic number, which helps in identifying it. The tutorial concludes with a summary by Dr. B.

What does the atomic number on the periodic table represent?

• The number of electrons

• The number of protons

• The atomic mass

• The number of neutrons

Which element has an atomic number of 2?

• Hydrogen

• Lithium

• Beryllium

• Helium

How can you identify an element using the periodic table?

• By its position in the table

• By its atomic number

• By its atomic mass

• By its color

What is another name for the atomic number?

• Mass number

• Neutron number

• Electron number

• Proton number

Why is the atomic number important in chemistry?

• It identifies the element

• It determines the element's color

• It shows the element's reactivity

• It measures the element's weight