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Regarding the modern periodic table, which of the following statements is incorrect?
- a)The elements present in any one group have the same number of valence electrons.
- b)Each valence shell indicates that the outer shell is filled with electrons
- c)The atomic radius decreases in moving from left to right along a period, whereas the atomic size increases down the group.
- d)Metallic character increases across a period and decreases down a group.
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
Regarding the modern periodic table, which of the following statement...
The incorrect statement regarding the modern periodic table is option 'D': Metallic character increases across a period and decreases down a group.
Explanation:
1. The elements present in any one group have the same number of valence electrons.
- This statement is correct. Elements in the same group of the periodic table have the same number of valence electrons. Valence electrons are the electrons present in the outermost energy level of an atom, and they determine the chemical properties of an element.
2. Each valence shell indicates that the outer shell is filled with electrons.
- This statement is correct. Each valence shell represents a filled energy level in an atom. The number of valence shells increases as you move down the periodic table, indicating that the outermost shell of the atom is filled with electrons.
3. The atomic radius decreases in moving from left to right along a period, whereas the atomic size increases down the group.
- This statement is correct. The atomic radius refers to the size of an atom, and it generally decreases from left to right along a period. This is because, as you move across a period, the number of protons and electrons increases, causing a stronger attraction between the nucleus and the electrons, leading to a decrease in atomic size. On the other hand, the atomic size increases down a group because each subsequent element has an additional energy level, resulting in larger atomic radii.
4. Metallic character increases across a period and decreases down a group.
- This statement is incorrect. Metallic character refers to the ability of an element to exhibit metallic properties such as high electrical and thermal conductivity, luster, and malleability. Metallic character generally decreases from left to right across a period as elements tend to become less metallic and more non-metallic in nature. However, metallic character increases down a group as the number of valence electrons increases, resulting in stronger metallic bonding.
In summary, option 'D' is the incorrect statement as metallic character increases down a group and not across a period.
Explanation:
1. The elements present in any one group have the same number of valence electrons.
- This statement is correct. Elements in the same group of the periodic table have the same number of valence electrons. Valence electrons are the electrons present in the outermost energy level of an atom, and they determine the chemical properties of an element.
2. Each valence shell indicates that the outer shell is filled with electrons.
- This statement is correct. Each valence shell represents a filled energy level in an atom. The number of valence shells increases as you move down the periodic table, indicating that the outermost shell of the atom is filled with electrons.
3. The atomic radius decreases in moving from left to right along a period, whereas the atomic size increases down the group.
- This statement is correct. The atomic radius refers to the size of an atom, and it generally decreases from left to right along a period. This is because, as you move across a period, the number of protons and electrons increases, causing a stronger attraction between the nucleus and the electrons, leading to a decrease in atomic size. On the other hand, the atomic size increases down a group because each subsequent element has an additional energy level, resulting in larger atomic radii.
4. Metallic character increases across a period and decreases down a group.
- This statement is incorrect. Metallic character refers to the ability of an element to exhibit metallic properties such as high electrical and thermal conductivity, luster, and malleability. Metallic character generally decreases from left to right across a period as elements tend to become less metallic and more non-metallic in nature. However, metallic character increases down a group as the number of valence electrons increases, resulting in stronger metallic bonding.
In summary, option 'D' is the incorrect statement as metallic character increases down a group and not across a period.
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Community Answer
Regarding the modern periodic table, which of the following statement...
As the effective nuclear charge acting on the valence shell electrons increases across a period, the tendency to lose electrons will decrease. Down the group, the effective nuclear charge experienced by valence electrons is decreasing because the outermost electrons are farther away from the nucleus.
Therefore, these can be lost easily. Hence metallic character decreases across a period and increases down a group.
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Regarding the modern periodic table, which of the following statements is incorrect?a) The elements present in any one group have the same number of valence electrons.b) Each valence shell indicates that the outer shell is filled with electronsc) The atomic radius decreases in moving from left to right along a period, whereas the atomic size increases down the group.d) Metallic character increases across a period and decreases down a group.Correct answer is option 'D'. Can you explain this answer?
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Regarding the modern periodic table, which of the following statements is incorrect?a) The elements present in any one group have the same number of valence electrons.b) Each valence shell indicates that the outer shell is filled with electronsc) The atomic radius decreases in moving from left to right along a period, whereas the atomic size increases down the group.d) Metallic character increases across a period and decreases down a group.Correct answer is option 'D'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Regarding the modern periodic table, which of the following statements is incorrect?a) The elements present in any one group have the same number of valence electrons.b) Each valence shell indicates that the outer shell is filled with electronsc) The atomic radius decreases in moving from left to right along a period, whereas the atomic size increases down the group.d) Metallic character increases across a period and decreases down a group.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Regarding the modern periodic table, which of the following statements is incorrect?a) The elements present in any one group have the same number of valence electrons.b) Each valence shell indicates that the outer shell is filled with electronsc) The atomic radius decreases in moving from left to right along a period, whereas the atomic size increases down the group.d) Metallic character increases across a period and decreases down a group.Correct answer is option 'D'. Can you explain this answer?.
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