Chemical Properties and Electron Configuration

The video tutorial by Mrs. Arriaga explains the concept of valence electrons and their role in determining an element's chemical reactivity. It covers how valence electrons are the outermost electrons and influence an element's ability to react. The tutorial uses examples like lithium, sodium, and chlorine to illustrate how elements achieve stability through chemical reactions. It also discusses atomic models, electron shells, and the stability of noble gases, emphasizing the importance of achieving a full valence shell for chemical stability.

What determines an element's chemical reactivity?

• The number of protons

• The number of valence electrons

• The number of neutrons

• The atomic mass

How many valence electrons does lithium have?

• Four

• Three

• Two

• One

What is the maximum number of electrons the first shell can hold?

• One

• Ten

• Two

• Eight

Which of the following elements has only one electron in its first shell?

• Beryllium

• Lithium

• Hydrogen

• Helium

How many electrons can the second shell of an atom hold?

• Eight

• Six

• Four

• Two

What makes an atom stable?

• Having a full valence shell

• Having more protons than electrons

• Having an equal number of protons and neutrons

• Having a high atomic mass

What is the 'magic number' of valence electrons for stability in larger elements?

• Eight

• Six

• Two

• Four

How do elements achieve their magic number of valence electrons?

• By changing their atomic number

• By gaining or losing protons

• By increasing their atomic mass

• Through chemical reactions

What happens when sodium and chlorine bond together?

• They form sodium chloride

• They form chlorine gas

• They form water

• They form sodium hydroxide

Why are noble gases considered stable?

• They have a high atomic mass

• They have an equal number of protons and neutrons

• They have more protons than electrons

• They have a full valence shell