Understanding Atomic Numbers and Elements

The video tutorial explains how to identify elements based on their atomic number, which is equal to the number of protons in an element. It uses the periodic table to demonstrate this concept, highlighting that each element has a unique atomic number. The tutorial provides an example with lithium, which has an atomic number of three, meaning it has three protons. The atomic number is sometimes referred to as the proton number, as it directly corresponds to the number of protons in an element.

What is the first step to determine which element has a specific number of protons?

• Count the number of electrons.

• Identify the element's group number.

• Look at the periodic table for the atomic number.

• Check the atomic mass of the element.

Where is the atomic number located on the periodic table?

• Below the element symbol.

• To the left of the element symbol.

• Above the element symbol.

• To the right of the element symbol.

Which element has an atomic number of 3?

• Beryllium

• Boron

• Lithium

• Helium

Why is the atomic number sometimes referred to as the proton number?

• Because it equals the number of neutrons.

• Because it equals the number of electrons.

• Because it equals the number of protons.

• Because it equals the atomic mass.

What makes each element's atomic number unique?

• It is the same for all elements in a group.

• It changes with the element's state.

• It is determined by the number of protons.

• It is based on the element's mass.