Chemistry
What are periods in a periodic table. What is meant by 'period number'. What does it signify.
Answer
Periods in the periodic table are the seven horizontal rows of elements arranged in increasing order of their atomic numbers.
Period number is the number assigned to each period i.e., 1, 2, 3, 4, 5, 6 or 7. It signifies the number of shells present in the atom of the element belonging to that period.
Related Questions
What were the defects and anomalies in Mendeleeff's Periodic Table and how are they resolved by Moseley.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table. State the Modern Periodic Law and compare it with Mendeleeff's Periodic Law.
Name the period which is the shortest period and state the number of elements present in it. State the number of elements in the second and the third periods of the periodic table.
Name the elements in the correct order of their increasing atomic numbers present in the first, second and third short periods of the periodic table.
State which of the elements are – (a) metallic (b) non-metallic (c) noble gases in each of the periods 2 and 3.