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Which of the following properties increases from…

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CHEMISTRY

Which of the following properties increases from left to right along the period but decreases down the group in the periodic table?

i. Atomic number ii. Ionization energy iii. Metallic character iv. Electron affinity

  • A. ii and iii only
  • B. ii and iv only
  • C. iii and iv only
  • D. i and ii only

QUICK ANSWER…

B

SOLUTION 

Atomic number of an element is the number of protons present in the nucleus of its atom, it increases from left to right, and also increases down the group.

Ionization energy is the energy required to remove the outermost electron(s) from the shell of an element. It increases from left to right across a period and decreases down a given group.

Metallic characters are the known properties exhibited by metals, as we move from metals to non-metals, they decrease from left to right across a period, but increase from top to bottom within a group.

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Electron affinity is the tendency of an element to attract electron(s), it increases from left to right within the same period, but decreases down a group.

Now for the right answer to the above question:

  1. Option A is incorrect. metallic character actually decreases from left to right along the same period, and increases down a group.
  2. Option B is correct.
  3. C is incorrect. metallic character actually decreases from left to right along the same period, and increases down a group.
  4. D is not the correct answer. Atomic number increases in both directions.

QUICK TIPS…

You may please note these/this:

  • Changes in ionization potential and electron affinity as we move through the periodic table, are similar.

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/culled from 2019 JAMB-UTME Chemistry question 32/

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