Valence Electrons and Reactivity

The video tutorial reviews valence electrons and their impact on the reactivity of elements. It explains that elements in the same group on the periodic table have the same number of valence electrons, which influences their reactivity. The tutorial highlights that reactivity increases in metals towards the left and in non-metals towards the right. Group 1 elements are highly reactive due to having one valence electron, while Group 17 elements are reactive because they have seven valence electrons. Noble gases in Group 18 are stable and non-reactive due to having a full valence shell of eight electrons.

What is the main factor that determines the reactivity of an element?

• The number of valence electrons

• The number of neutrons

• The number of protons

• The atomic mass

What is the common characteristic of elements in the same group on the periodic table?

• Same number of protons

• Same atomic mass

• Same number of valence electrons

• Same number of neutrons

In which direction does reactivity increase for metals on the periodic table?

• Downwards

• Towards the left

• Upwards

• Towards the right

Why are Group 1 elements highly reactive?

• They have a full outer shell

• They have seven valence electrons

• They have one valence electron they want to lose

• They need to gain one electron

How many valence electrons do Group 1 elements have?

• Seven

• One

• Eight

• Two

What do Group 17 elements need to achieve stability?

• Lose two valence electrons

• Gain two valence electrons

• Gain one valence electron

• Lose one valence electron

Which group of elements tends to gain one electron to become stable?

• Group 2

• Group 1

• Group 17

• Group 18

Which group of elements is known for being stable and non-reactive?

• Group 1

• Group 17

• Group 18

• Group 2

What is the valence electron configuration of noble gases?

• Eight valence electrons

• Seven valence electrons

• Two valence electrons

• One valence electron

What is the significance of a full valence shell in terms of reactivity?

• It increases the atomic mass

• It makes the element stable and non-reactive

• It decreases the atomic number

• It makes the element highly reactive