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Which of the following physical properties decreases across the periodic Table?

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Which of the following physical properties decreases across the periodic Table?

A. ionization potential

B. Electron affinity

C. Electronegativity

D. Atomic radius

QUICK ANSWER…

D

DETAILS…  

Atomic radius decreases from left to right as we move across the periodic table. This is because as the number of protons increases, the force of attraction between the positively charged nucleus and the negatively charged shell increases.

However, atomic radius increases down the group due to increase in number of shells.

Now for the right answer to the above question:

  1. Option A is incorrect. Ionization potential is simply the amount of energy required to remove an electron from the outermost shell of an atom. It increases across the period and decreases down the group.
  2. Option B is incorrect. Electron affinity is the amount of energy released when an electron is added to the outermost shell of a neutral atom or molecule, it also increases across the period and decreases down the group.
  3. C is incorrect. Electronegativity is the tendency of an atom to gain electron(s), it increases across the period as we move towards non-metals in the periodic table.
  4. D is the correct answer.
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KEY-POINTS…

You may please note these/this:

  • As the number of charges increase within the same shell, the electrostatic force of attraction between the nucleus and the shell also increases, thereby decreasing the shell radius.

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/ culled from 2016 JAMB-UTME Chemistry past question 37 /

Which of the following physical properties decreases across the periodic Table? » QuizTablet
Which of the following physical properties decreases across the periodic Table? » QuizTablet

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