Learn: Atomic Structure and the Periodic Table

Welcome!Today we'll learn about Atomic Structure and the Periodic Table. This topic is essential for understanding the building blocks of chemistry and how elements are organised.

What is Atomic Structure?Atoms are the smallest particles that make up elements. They consist of three main subatomic particles: protons, neutrons, and electrons. Understanding atomic structure helps us explain chemical reactions and properties of matter.

Subatomic Particles- Protons: Positively charged particles found in the nucleus. They determine the atomic number of an element.- Neutrons: Neutral particles found in the nucleus. They add mass but do not affect charge.- Electrons: Negatively charged particles that orbit the nucleus in energy levels.

What are Isotopes?Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. This means they have different mass numbers but the same chemical properties.

Electronic ConfigurationElectronic configuration shows how electrons are arranged around the nucleus in energy levels. The first energy level can hold 2 electrons, the second can hold 8, and the third can hold 8.

Development of the Periodic TableThe periodic table was developed by Dmitri Mendeleev, who organised elements based on their atomic mass and predicted properties of undiscovered elements. Modern periodic tables are organised by atomic number.

Review Time!Great work! You've learned about atomic structure, isotopes, and the periodic table. Now let's test your understanding with a few questions.