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Four elements W, X, Y and Z have atomic numbers…

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Four elements W, X, Y and Z have atomic numbers 2, 6, 16 and 20 respectively. Which of these elements is a metal?

A. X

B. W

C. Z

D. Y

QUICK ANSWER…

C

SOLUTION…  

Metals generally have 1, 2, or 3 electrons in the outermost shell. So, when faced with a question as above, writing out the electronic configuration of each element will help to reveal which of them is a metal.

Using the 2, 8, 8, 18 formats to configure the electrons, we have:

W = 2 = 2, 0 = 0 electrons in the outermost shell.

X = 6 = 2, 4 = 4 electrons in the outermost shell.

Y = 16 = 2, 8, 6 = 6 electrons in the outermost shell.

Z = 20 = 2, 8, 8, 2 = 2 electrons in the outermost shell.

Now for the right answer to the above question:

  1. Option A is incorrect. X has 4 electrons in the outermost shell, it is not a metal.
  2. Option B is incorrect. W has 0 electrons in the outermost shell, it is a noble gas and not a metal.
  3. C is correct. Z has two electrons in the outermost shell, it is a metal.
  4. D is not the correct answer. Y has 6 electrons in the outermost shell, it is a non-metal.
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QUICK TIPS…

You may please note these/this:

  • Metals generally have 1, 2 or 3 electrons in the outermost shell.
  • W has 0 or 2 electrons in the outermost shell, but this is not a metal, in fact this is helium, a noble gas.

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/ culled from 2017 JAMB-UTME Chemistry question 9 /

Four elements W, X, Y and Z have atomic numbers... » QuizTablet
Four elements W, X, Y and Z have atomic numbers... » QuizTablet

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