Understanding Atomic Numbers and Elements

The video tutorial explains how to identify an element on the periodic table by its atomic number, which is equal to the number of protons in the element's nucleus. The tutorial focuses on finding the element with 12 protons, which is magnesium. The atomic number is a unique identifier for each element, and magnesium is the only element with an atomic number of 12.

What does the atomic number of an element represent?

• The number of electrons

• The atomic mass

• The number of protons

• The number of neutrons

Where can you find the atomic number on the periodic table?

• Beside the atomic mass

• Next to the element name

• Above the element symbol

• Below the element symbol

How does the atomic number change as you move across a period on the periodic table?

• It decreases

• It remains the same

• It increases

• It fluctuates

Which element is identified by having 12 protons?

• Calcium

• Aluminum

• Magnesium

• Sodium

Why is the atomic number considered a unique identifier for elements?

• Because it changes with temperature

• Because it is the same for all elements

• Because it is unique to each element

• Because it varies with pressure