Which of the following statements about the Modern Periodic Table is correct:
(a) It has 18 horizontal rows known as Periods
(b) It has 7 vertical columns known as Periods
(c) It has 18 vertical columns known as Groups
(d) It has 7 horizontal rows known as Groups
NCERT Class X
Science - Exemplar Problems
Chapter_Periodic Classification of Elements
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(c)it has 18 vertical columns known as groups
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Answer:
(c) 18 vertical columns known as Groups
Explanation:
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