All Courses
Explore Courses UPSC Exam UPSC Test Series Free Notes EduRev Infinity Get the App Login Join for Free
Sign in Open App
NEET Exam  >  NEET Questions  >  In which of the following is there a consiste... Start Learning for Free
SaveJoin the Discussion on the App
In which of the following is there a consistent aecrease in atomic radius as the atomic number increases?
  • a)
    halogens
  • b)
    elements in a period
  • c)
    transition elements
  • d)
    lanthanides
Correct answer is option 'B'. Can you explain this answer?
FREE This question is part of
Download PDF Attempt Test
Download PDF Attempt this Test
Most Upvoted Answer
In which of the following is there a consistent aecrease in atomic rad...
Consistent Decrease in Atomic Radius in Elements in a Period

Explanation:
- Atomic radius is the distance between the nucleus and the outermost electron shell of an atom.
- The atomic radius generally decreases as you move from left to right across a period in the periodic table.
- This is due to the increasing nuclear charge (number of protons) which attracts the electrons closer to the nucleus, making the atomic radius smaller.
- The electrons are in the same energy level or shell, but the effective nuclear charge increases, making the atomic radius smaller.
- The trend is not consistent throughout the periodic table, as there are some exceptions due to electron configurations and shielding effects.

Example:
- In period 3, the atomic radius decreases from sodium to chlorine.
- Sodium has the largest atomic radius in period 3 because it has only three energy levels and one electron in its outermost shell.
- Chlorine, on the other hand, has the smallest atomic radius because it has one more proton than sodium, increasing the effective nuclear charge and pulling the electrons closer to the nucleus.

Conclusion:
- The trend of decreasing atomic radius in elements in a period is due to the increasing nuclear charge and is a fundamental trend in the periodic table.
Free Test
FREE
Start Free Test
Start Free Test
Community Answer
In which of the following is there a consistent aecrease in atomic rad...
As the number of electrons in a given shell increase along a period, effective nuclear charge increase.so, atomic size decrease because electrons are held by the atom more strongly.
In halogens, atomic size increase down the group.On the other hand, transition elements and lanthanides do not have consistent decrease.
so, option b is correct.
Attention NEET Students!
To make sure you are not studying endlessly, EduRev has designed NEET study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in NEET.
< Previous Question Next Question >
Explore Courses for NEET exam

Similar NEET Doubts

Read the passage given below and answer the following questions:Nucleophilic substitution reaction of haloalkane can be conducted according to both SN1 and SN2 mechanisms. However, which mechanism it is based on is related to such factors as the structure of haloalkane, and properties of leaving group, nucleophilic reagent and solvent. Influences of halogen: No matter which mechanism the nucleophilic substitution reaction is based on, the leaving group always leave the central carbon atom with electron pair. This is just the opposite of the situation that nucleophilic reagent attacks the central carbon atom with electron pair. Therefore, the weaker the alkalinity of leaving group is , the more stable the anion formed is and it will be more easier for the leaving group to leave the central carbon atom; that is to say, the reactant is more easier to be substituted. The alkalinity order of halogen ion is I− < Br− < Cl− < F− and the order of their leaving tendency should be I− > Br− > Cl− > F−. Therefore, in four halides with the same alkyl and different halogens, the order of substitution reaction rate is RI > RBr > RCl > RF. In addition, if the leaving group is very easy to leave, many carbocation intermediates are generated in the reaction and the reaction is based on SN1 mechanism. If the leaving group is not easy to leave, the reaction is based on SN2 mechanism. Influences of solvent polarity: In SN1 reaction, the polarity of the system increases from the reactant to the transition state, because polar solvent has a greater stabilizing effect on the transition state than the reactant, thereby reduce activation energy and accelerate the reaction. In SN2 reaction, the polarity of the system generally does not change from the reactant to the transition state and only charge dispersion occurs. At this time, polar solvent has a great stabilizing effect on Nu than the transition state, thereby increasing activation energy and slow down the reaction rate. For example, the decomposition rate (SN1) of tertiary chlorobutane in 25° water (dielectric constant 79) is 300000 times faster than in ethanol (dielectric constant 24). The reaction rate (SN2) of 2-bromopropane and NaOH in ethanol containing 40% water is twice slower than in absolute ethanol. In a word, the level of solvent polarity has influence on both SN1 and SN2 reactions, but with different results. Generally speaking, weak polar solvent is favorable for SN2 reaction, while strong polar solvent is favorable for SN1 reaction, because only under the action of polar solvent can halogenated hydrocarbon dissociate into carbocation and halogen ion and solvents with a strong polarity is favorable for solvation of carbocation, increasing its stability. Generally speaking, the substitution reaction of tertiary haloalkane is based on SN1 mechanism in solvents with a strong polarity (for example, ethanol containing water).Q. SN1 reaction will be fastest in which of the following solvents?

Top Courses for NEETView all

Top Courses for NEET

In which of the following is there a consistent aecrease in atomic radius as the atomic number increases?a)halogensb)elements in a periodc)transition elementsd)lanthanidesCorrect answer is option 'B'. Can you explain this answer?
Question Description
In which of the following is there a consistent aecrease in atomic radius as the atomic number increases?a)halogensb)elements in a periodc)transition elementsd)lanthanidesCorrect answer is option 'B'. 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 In which of the following is there a consistent aecrease in atomic radius as the atomic number increases?a)halogensb)elements in a periodc)transition elementsd)lanthanidesCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In which of the following is there a consistent aecrease in atomic radius as the atomic number increases?a)halogensb)elements in a periodc)transition elementsd)lanthanidesCorrect answer is option 'B'. Can you explain this answer?.
Solutions for In which of the following is there a consistent aecrease in atomic radius as the atomic number increases?a)halogensb)elements in a periodc)transition elementsd)lanthanidesCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free.
Here you can find the meaning of In which of the following is there a consistent aecrease in atomic radius as the atomic number increases?a)halogensb)elements in a periodc)transition elementsd)lanthanidesCorrect answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of In which of the following is there a consistent aecrease in atomic radius as the atomic number increases?a)halogensb)elements in a periodc)transition elementsd)lanthanidesCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for In which of the following is there a consistent aecrease in atomic radius as the atomic number increases?a)halogensb)elements in a periodc)transition elementsd)lanthanidesCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of In which of the following is there a consistent aecrease in atomic radius as the atomic number increases?a)halogensb)elements in a periodc)transition elementsd)lanthanidesCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice In which of the following is there a consistent aecrease in atomic radius as the atomic number increases?a)halogensb)elements in a periodc)transition elementsd)lanthanidesCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice NEET tests.
Explore Courses for NEET exam

Top Courses for NEET

Explore Courses

Suggested Free Tests

Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Get App
© EduRev
Education Revolution
Signup to see your scores go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup