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? [NCERT Exemplar]
A. A, B, C
B. B, C, D
C. A, D, E
D. B, D, E
Answer:B
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? [NCERT Exemplar]
A. A, B, C B. B, C, D C. A, D, E D. B, D, E