Predicting How Elements Behave

The video explores the development of the periodic table by Dmitri Mendeleev, who arranged elements by atomic weight and predicted undiscovered elements. The modern table uses atomic numbers, but Mendeleev's principles remain. It explains periodic trends like atomic radius and ionization energy, and how valence electrons determine element groups. The octet rule helps predict element bonding, using examples like oxygen, carbon, sodium, and chlorine. Mendeleev's work aids in understanding chemical and physical properties of elements.

Who published the precursor to the modern periodic table in 1869?

• Albert Einstein

• Marie Curie

• Dmitri Mendeleev

• Isaac Newton

What is the modern periodic table primarily arranged by?

• Increasing atomic weight

• Decreasing atomic number

• Increasing atomic number

• Decreasing atomic weight

As you move from left to right across a period in the periodic table, what happens to the atomic radius?

• It decreases

• It increases

• It fluctuates

• It remains the same

What rule helps predict how elements will gain or lose electrons to form bonds?

• Pauli Exclusion Principle

• Octet Rule

• Hund's Rule

• Heisenberg Uncertainty Principle

When sodium and chlorine react, what happens to their electrons?

• Sodium loses an electron, chlorine gains one

• Both gain electrons

• Sodium gains an electron, chlorine loses one

• Both lose electrons