Chemistry
What is the number of elements in the :
(a) 1st period, and
(b) 3rd period, of the modern periodic table?
Related Questions
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period of the periodic table ?
(a) What are the following groups known as?
- Group 1
- Group 17
- Group 18
(b) Name two elements of each group.
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?
How do atomic structures (electron arrangements) change in a period with an increase in atomic numbers, moving from left to right?