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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Answers

2015-05-30T12:24:42+05:30
(c)it has 18 vertical columns known as groups

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