According to the law of triads, when chemically similar elements are arranged in groups of three in the order of increasing atomic weights, then the________element has the atomic weight and properties roughly the average of the other two elements.

Options

A. first
B. middle
C. third
D. every

Answer

B

Explanation

Elements in a triad not only has similar properties but also the atomic weight of the middle element was approximately an average of the atomic weights of the other two elements of the triad. Also, the properties of the central element were in-between those of the end members.