Answer :
Answer:
The ending of the each row of periodic table is marked by a D) nobel gas.
Explanation:
Tabular arrangement of all the known elements according to their rising atomic number is called as periodic table. It has 18 groups and 7 periods.
The elements present in them are classified as metals, non-metals, and metalloids based on the physical and chemical properties exhibited by them. The 7 periods are arranged in row format in which the starting of the row is marked by metals and ending is marked by nobel gas.
Periodic table is displayed in the image below.
Each row in the periodic table ends with a Noble gas. The correct option is D.
The periodic table is organized in rows called periods, and each period represents a different energy level (shell) of the elements. Noble gases are a group of chemical elements found in Group 18 (VIII A) of the periodic table. They are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Noble gases are unique because they have a full valence electron shell, making them stable and unreactive under normal conditions. Their outermost electron shell is completely filled with electrons, which gives them little tendency to gain, lose, or share electrons with other elements.
Due to their inert nature, noble gases are often used in various applications, such as lighting (neon signs), cooling (liquid helium), and shielding (argon-filled bulbs) in scientific and industrial processes. The fact that each row in the periodic table ends with a noble gas is a significant pattern that reflects the periodicity of element properties based on their electron configurations.
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