Answer: The correct answer is Option B.
Step-by-step explanation:
Elements are distributed into 7 period and 18 Groups in a periodic table.
Elements are classified into three categories:
- Metals: They are called as metals because they loose electrons to attain stability. They are hard and are mainly solid.
- Non-metals: They are called as non-metals because they gain electrons to attain stability. They are soft and are mainly liquid or gases.
- Metalloids: They are called as metalloids because they show properties of both metals and non-metals. There are 7 metalloids in the periodic table. They are Boron, Silicon, Germanium, Arsenic, Antimony, Tellurium and Polonium
From the given options:
Option A: Phosphorus is a non-metal belonging to Group 15 and Period 3 of the periodic table.
Option B: Arsenic is a metalloid belonging to Group 15 and Period 4 of the periodic table.
Option C: Krypton is a noble gas belonging to Group 18 and Period 4 of the periodic table.
Option D: Rubidium is a metal belonging to Group 1 and Period 5 of the periodic table.
Hence, the correct answer is Option B.