Question

1. choose the best answer. (see companion material, the periodical table, attached.) which element is part of the d - block? ac co u b 12) choose the best answer. (see companion material, the periodical table, attached.) which element belongs to the f - block? nd be f zr 13) choose the best answer. (see companion material, the periodical table, attached.) how many energy levels does xe have? 1 5 8 2

Explanation:

1. For question 11: The d-block includes transition metals. Cobalt (Co) is a transition metal in the d-block; Ac is f-block, U is f-block, B is p-block.
2. For question 12: The f-block consists of lanthanides and actinides. Neodymium (Nd) is a lanthanide (f-block); Be is s-block, F is p-block, Zr is d-block.
3. For question 13: Xenon (Xe) is in period 5 of the periodic table, which means it has 5 occupied energy levels corresponding to its period number.

Answer:

1. Co
2. Nd
3. 5