The elements in the modern periodic table are arranged on the basis of their increasing atomic number.
A. Only (I)
B. (I), (II), and (III)
C. (I), (II), and (IV)
D. Only (IV)
Answer:B
The elements in the modern periodic table are arranged on the basis of their increasing atomic number.
A. Only (I) B. (I), (II), and (III) C. (I), (II), and (IV) D. Only (IV)
Explanation: The modern periodic table is a tabular arrangement of elements in increasing order of their atomic number, which is why isotopes are placed at the same position. Hence, only (III) is correct.