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Which of the following statements regarding the variation of atomic radii in the periodic table is not true?
- a)In a group, there is continuous increase in size with increase in atomic number
- b)In 4f-series, there is a continuous decrease in size with increase in atomic number
- c)The size of inert gases is larger than halogens
- d)In 3rd period, the size of atoms increases with increase in atomic number
Correct answer is option 'D'. Can you explain this answer?
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Which of the following statements regarding the variation of atomic ra...
Size of atoms decreases with increases in atomic number in a period.
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Which of the following statements regarding the variation of atomic ra...
Explanation:
In the periodic table, the atomic radius refers to the size of an atom. It is defined as the distance between the nucleus and the outermost electron shell of an atom. The atomic radius varies across the periodic table due to the distribution of electrons and the effective nuclear charge experienced by the outermost electrons.
Statement (a): In a group, there is continuous increase in size with increase in atomic number
This statement is true. In a group, elements have the same number of valence electrons and similar electron configurations. As we move down a group, the number of electron shells increases, resulting in an increase in atomic size. This is due to the shielding effect of inner electron shells, which reduces the attraction between the nucleus and the outermost electrons.
Statement (b): In 4f-series, there is a continuous decrease in size with increase in atomic number
This statement is true. The 4f-series consists of the lanthanides, which are located in the f-block of the periodic table. As we move across the lanthanide series, the atomic number increases, resulting in a decrease in atomic size. This is because the increasing number of protons in the nucleus exerts a stronger attraction on the electrons, leading to a contraction in atomic radius.
Statement (c): The size of inert gases is larger than halogens
This statement is true. Inert gases, also known as noble gases, have completely filled electron shells. They are located in Group 18 of the periodic table. The halogens, on the other hand, are located in Group 17. Inert gases have larger atomic radii compared to halogens because inert gases have more electron shells and experience less effective nuclear charge due to greater electron-electron repulsion.
Statement (d): In 3rd period, the size of atoms increases with increase in atomic number
This statement is not true. In the 3rd period, the atomic size does not strictly increase with atomic number. The trend is not continuous due to the difference in electron configurations. While the atomic size generally increases from left to right across a period, there are exceptions due to variations in the effective nuclear charge and electron-electron repulsion. For example, the atomic radius of sodium (Na) is larger than that of magnesium (Mg) in the 3rd period.
Therefore, the correct answer is option D - In the 3rd period, the size of atoms increases with increase in atomic number.
In the periodic table, the atomic radius refers to the size of an atom. It is defined as the distance between the nucleus and the outermost electron shell of an atom. The atomic radius varies across the periodic table due to the distribution of electrons and the effective nuclear charge experienced by the outermost electrons.
Statement (a): In a group, there is continuous increase in size with increase in atomic number
This statement is true. In a group, elements have the same number of valence electrons and similar electron configurations. As we move down a group, the number of electron shells increases, resulting in an increase in atomic size. This is due to the shielding effect of inner electron shells, which reduces the attraction between the nucleus and the outermost electrons.
Statement (b): In 4f-series, there is a continuous decrease in size with increase in atomic number
This statement is true. The 4f-series consists of the lanthanides, which are located in the f-block of the periodic table. As we move across the lanthanide series, the atomic number increases, resulting in a decrease in atomic size. This is because the increasing number of protons in the nucleus exerts a stronger attraction on the electrons, leading to a contraction in atomic radius.
Statement (c): The size of inert gases is larger than halogens
This statement is true. Inert gases, also known as noble gases, have completely filled electron shells. They are located in Group 18 of the periodic table. The halogens, on the other hand, are located in Group 17. Inert gases have larger atomic radii compared to halogens because inert gases have more electron shells and experience less effective nuclear charge due to greater electron-electron repulsion.
Statement (d): In 3rd period, the size of atoms increases with increase in atomic number
This statement is not true. In the 3rd period, the atomic size does not strictly increase with atomic number. The trend is not continuous due to the difference in electron configurations. While the atomic size generally increases from left to right across a period, there are exceptions due to variations in the effective nuclear charge and electron-electron repulsion. For example, the atomic radius of sodium (Na) is larger than that of magnesium (Mg) in the 3rd period.
Therefore, the correct answer is option D - In the 3rd period, the size of atoms increases with increase in atomic number.
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Which of the following statements regarding the variation of atomic radii in the periodic table is not true?a)In a group, there is continuous increase in size with increase in atomic numberb)In 4f-series, there is a continuous decrease in size with increase in atomic numberc)The size of inert gases is larger than halogensd)In 3rdperiod, the size of atoms increases with increase in atomic numberCorrect answer is option 'D'. Can you explain this answer?
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Which of the following statements regarding the variation of atomic radii in the periodic table is not true?a)In a group, there is continuous increase in size with increase in atomic numberb)In 4f-series, there is a continuous decrease in size with increase in atomic numberc)The size of inert gases is larger than halogensd)In 3rdperiod, the size of atoms increases with increase in atomic numberCorrect answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following statements regarding the variation of atomic radii in the periodic table is not true?a)In a group, there is continuous increase in size with increase in atomic numberb)In 4f-series, there is a continuous decrease in size with increase in atomic numberc)The size of inert gases is larger than halogensd)In 3rdperiod, the size of atoms increases with increase in atomic numberCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements regarding the variation of atomic radii in the periodic table is not true?a)In a group, there is continuous increase in size with increase in atomic numberb)In 4f-series, there is a continuous decrease in size with increase in atomic numberc)The size of inert gases is larger than halogensd)In 3rdperiod, the size of atoms increases with increase in atomic numberCorrect answer is option 'D'. Can you explain this answer?.
Which of the following statements regarding the variation of atomic radii in the periodic table is not true?a)In a group, there is continuous increase in size with increase in atomic numberb)In 4f-series, there is a continuous decrease in size with increase in atomic numberc)The size of inert gases is larger than halogensd)In 3rdperiod, the size of atoms increases with increase in atomic numberCorrect answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following statements regarding the variation of atomic radii in the periodic table is not true?a)In a group, there is continuous increase in size with increase in atomic numberb)In 4f-series, there is a continuous decrease in size with increase in atomic numberc)The size of inert gases is larger than halogensd)In 3rdperiod, the size of atoms increases with increase in atomic numberCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements regarding the variation of atomic radii in the periodic table is not true?a)In a group, there is continuous increase in size with increase in atomic numberb)In 4f-series, there is a continuous decrease in size with increase in atomic numberc)The size of inert gases is larger than halogensd)In 3rdperiod, the size of atoms increases with increase in atomic numberCorrect answer is option 'D'. Can you explain this answer?.
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