Electron Energy Levels and Valency

The video explains atomic structure, focusing on protons, electrons, and neutrons. It details electron shells and their role in stability, introduces valence electrons and their impact on reactivity, and shows how the periodic table helps determine valency. It concludes with a discussion on chemical bonds, including ionic and covalent bonds, and their properties.

What particles are found in the nucleus of an atom?

• Protons and electrons

• Only protons

• Protons and neutrons

• Electrons and neutrons

What is the significance of valence electrons in an atom?

• They are found in the nucleus

• They determine the chemical reactivity

• They are responsible for the atom's color

• They determine the atomic mass

Which element is stable with two valence electrons?

• Krypton

• Argon

• Neon

• Helium

How many valence electrons does an element in group 7 of the periodic table have?

• 8

• 7

• 5

• 1

What is the valency of sodium in sodium chloride?

• Three

• Two

• One

• Zero

What type of bond involves the sharing of electrons between atoms?

• Hydrogen bond

• Metallic bond

• Covalent bond

• Ionic bond

Which of the following is an example of an ionic bond?

• Sodium chloride (NaCl)

• Methane (CH4)

• Oxygen (O2)

• Water (H2O)