Trends in the Modern Periodic Table Valency : As you know, the valency of an element is determined by the number of valence electrons present in the termost shell of its atom. Activity 5.6 How do you calculate the valency of an element from its electronic configuration? What is the valency of magnesium with atomic…

Position of Elements in the Modern Periodic Table The Modern Periodic Table has 18 vertical columns known as ‘groups’ and 7 horizontal rows known as ‘periods’. Let us see what decides the placing of an element in a certain group and period. Activity 5.4 Look at the group 1 of the Modern Periodic Table, and…