Question

6. Give one important difference between the following (based on the word in brackets).
(i) Period and group (shell)
(ii) Atomic mass and atomic number (neutrons)
(iii) Period and group (atomic size)
(iv) Metals and non-metals (reducing properties)
(v) Modern periodic table and Mendeleev periodic table (atomic number)
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Answer 1

Explanation:

(I) no of shell same across period but increases down a group

(ii) increases while going across period or down a grp