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Which of the following statements are in...

Which of the following statements are incorrect ?
I. The atomic radii increase along a period from left to right.
II. In Modern Periodic Table, isotopes are given separate places.
III. The oxides of metals are basic in nature.
IV. `Na, Mg` and `Al` belong to the same period.

A

I and IV only

B

II and IV only

C

I and II only

D

III and IV only

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the statements are incorrect, let's analyze each statement one by one. ### Step-by-Step Solution: **Statement I:** "The atomic radii increase along a period from left to right." - **Analysis:** This statement is incorrect. As we move from left to right across a period in the periodic table, the atomic radius actually decreases. This is due to the increase in the effective nuclear charge, which pulls the electrons closer to the nucleus, resulting in a smaller atomic radius. **Statement II:** "In the Modern Periodic Table, isotopes are given separate places." - **Analysis:** This statement is also incorrect. In the modern periodic table, isotopes of an element do not occupy separate places. They have the same atomic number but different mass numbers, and they are represented in the same position in the table since the periodic table is organized by atomic number. **Statement III:** "The oxides of metals are basic in nature." - **Analysis:** This statement is correct. Metal oxides typically exhibit basic properties. For example, sodium oxide (Na2O) and magnesium oxide (MgO) react with water to form hydroxides, which are basic. **Statement IV:** "Na, Mg, and Al belong to the same period." - **Analysis:** This statement is incorrect. Sodium (Na), Magnesium (Mg), and Aluminum (Al) do not belong to the same period; they belong to the third period of the periodic table. Sodium is in Group 1, Magnesium in Group 2, and Aluminum in Group 13, all within Period 3. ### Conclusion: The incorrect statements are: - Statement I: Incorrect - Statement II: Incorrect - Statement IV: Incorrect ### Final Answer: The incorrect statements are I, II, and IV. ---
To determine which of the statements are incorrect, let's analyze each statement one by one. ### Step-by-Step Solution: **Statement I:** "The atomic radii increase along a period from left to right." - **Analysis:** This statement is incorrect. As we move from left to right across a period in the periodic table, the atomic radius actually decreases. This is due to the increase in the effective nuclear charge, which pulls the electrons closer to the nucleus, resulting in a smaller atomic radius. **Statement II:** "In the Modern Periodic Table, isotopes are given separate places." ...
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