1. Arrange in order of increasing nonmetallic character (a) the Period 4 elements Se, Ca, and Mn, and (b) the Group 6A elements Se, Po, and O.
2. Arrange in order of increasing ionization energy (a) the Group 1A elements Na, Cs, and K, and (b) the Period 4 elements As, Ca, and Br.
The father of periodic table is the Mendeleev. The arrangement of the known elements in certain groups in such a way so that the elements with similar properties are grouped together is known as the classification of elements.
Answer and Explanation:
The increasing trend in the non-metallic character is increasing from left to right across a period. Therefore, Mn < Ca < Se.
For the case in a group the non-metallic character increases from bottom to top. Therefore, O < Po < Se.
The ionization energy increases as we go up the periodic table with respect to a group. Therefore, K < Cs < Na.
The ionization energy increases as we go from left to right across a period in the periodic table. Therefore, the ionization energy of the given is Br < Ca < As.
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from Chemistry 101: General ChemistryChapter 3 / Lesson 1