Question

What are the changes occurred in following in periods and groups of modern periodic table.
a. valency
b. atomic size
c. atomic radius
d. Metallic and Non metallic properties.

Answer 1

Answer:

a. valency - periods- increases

                 - groups - same

b. atomic size - periods- decreases

                       - groups - increases

c. atomic radius - periods- increases

                          - groups - decreases

d. properties - periods -metallic character increases

                      - groups - metallic character decreases and non-metallic                                                  

                                       character increases

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Answer 2

Answer:

Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.