Question

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Answer 1

Answer:

Dobereiner's Triads are groups of three elements arranged in such a way that the atomic weight of the middle element is almost the average of the other two. The elements of triad have almost similar properties. For example, consider Li,Na and K with atomic weights 7,23 and 39 g/mol respectively. 27+39=23

Explanation:

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Answer 2

Defensive drivers maintain a safe following distance. Defensive drivers anticipate what may or may not happen while on the roadway, and they take action to avoid many problems.

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