It is very helpful to remember the names of important groups in the periodic table: Group 1 (Alkali Metals), Group 2 (Alkaline Earth Metals), Group 15 (Pnictogens), Group 16 (Chalcogens), Group 17 (Halogens), and Group 18 (Noble Gases).
Step 1: Understanding the Question:
The question asks to identify the set of elements that belong to the chalcogen group of the periodic table. Step 2: Key Formula or Approach:
This is a question based on knowledge of the periodic table. The chalcogens are the elements in Group 16. Step 3: Detailed Explanation:
Group 16 of the periodic table is known as the oxygen family or the chalcogens. The elements in this group are:
- Oxygen (O)
- Sulfur (S)
- Selenium (Se)
- Tellurium (Te)
- Polonium (Po)
- Livermorium (Lv) (synthetic)
Now let's examine the given options:
(A) Se, Tb and Pu: Selenium (Se) is a chalcogen, but Terbium (Tb) is a lanthanide and Plutonium (Pu) is an actinide. So, this option is incorrect.
(B) S, Te and Pm: Sulfur (S) and Tellurium (Te) are chalcogens, but Promethium (Pm) is a lanthanide. So, this option is incorrect.
(C) Se, Te and Po: Selenium (Se), Tellurium (Te), and Polonium (Po) are all members of the chalcogen group. So, this option is correct.
(D) O, Ti and Po: Oxygen (O) and Polonium (Po) are chalcogens, but Titanium (Ti) is a transition metal (Group 4). So, this option is incorrect. Step 4: Final Answer:
The set of elements that are all chalcogens is Se, Te and Po. This corresponds to option (C).
