Understanding Group 1 and Valency

The video tutorial covers basic concepts of the periodic table, including groups and periods, valence electrons, and valency. It explains how to compare elements based on their valence electrons and identify chemically dissimilar pairs. The session also discusses the tendency of elements to lose electrons, focusing on group one elements. The tutorial concludes with a brief farewell.

What does the group number in the periodic table indicate?

• The number of valence electrons

• The atomic mass

• The number of neutrons

• The number of protons

If an element belongs to Group 1, how many valence electrons does it have?

• One

• Two

• Three

• Four

What is the valency of an element in Group 2?

• Three

• Two

• One

• Four

What is the relationship between group number and valency for metals?

• Group number is half the valency

• Group number is the same as valency

• Group number is double the valency

• Group number is unrelated to valency

Which pair of elements is chemically dissimilar?

• Sodium and Chlorine

• Chlorine and Bromine

• Sodium and Potassium

• Calcium and Zinc

Why are sodium and chlorine considered chemically dissimilar?

• Both are metals

• Both belong to the same group

• Both are nonmetals

• One is a metal and the other is a nonmetal

Which element has the greatest tendency to lose electrons?

• Chlorine

• Sodium

• Beryllium

• Bromine

Why does sodium lose electrons easily?

• It has a high atomic mass

• It is in Group 1 with one valence electron

• It has a full outer shell

• It is a nonmetal

Which group has elements that cannot lose even one electron easily?

• Group 1

• Group 2

• Group 7

• Group 8

What is the main characteristic of elements in Group 1?

• They have high electronegativity

• They have a full outer shell

• They have one valence electron

• They are nonmetals