Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period? (a) A, B, C (b) B, C, D (c) A, D, E (d) B, D, E
ScienceClass 10CBSEAnswered 27 Mar 2026
Answer
Soln:
Answer is (b) B, C, D
Explanation:
Element with atomic number belong to first period and element B, C and D belongs to second period.