Chemistry
How does the number of (i) valence electrons (ii) valency; vary on moving from left to right:
(a) in the second period of a periodic table?
(b) in the third period of a periodic table?
Periodic Table
136 Likes
Answer
(a) In the second period of the periodic table, the number of valence electrons increase from 1 to 8 as we move from left to right. The valency first increases from 1 to 4 from element Lithium (Li) to Carbon (C) and then reduces to zero from element Nitrogen (N) till Neon (Ne).
(b) In the third period of the periodic table, the number of valence electrons increases from 1 to 8 as we move from left to right. The valency first increases from 1 to 4 from element Sodium (Na) to Silicon (Si) and then reduces to zero from element Phosphorus (P) till Argon (Ar).
Answered By
83 Likes
Related Questions
(a) What are the following groups known as?
- Group 1
- Group 17
- Group 18
(b) Name two elements of each group.
What is the number of elements in the :
(a) 1st period, and
(b) 3rd period, of the modern periodic table?
How do atomic structures (electron arrangements) change in a period with an increase in atomic numbers, moving from left to right?
State the criteria used by Mendeleev in proposing his periodic table?