The electron dot diagram for an unknown element X is shown. What element could this diagram represent?
electron-dot structure for an unknown element X with four dots, one on each side A. chlorine
B. magnesium
C. phosphorus
D. silicon
E. sulfur

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mariomontes mariomontes · Answer 1 · 2018-12-13T00:20:13+01:00

So like I asked my friend and he said the answer is D.

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kobenhavn kobenhavn · Answer 2 · 2019-01-19T13:37:23+01:00

Answer: D. silicon

Explanation: The electron dot diagram is a diagram that represents the valence electrons of the element as dots.

A. Chlorine: has atomic number of 17 and has 17 electrons. The electronic configuration is:[tex]Cl:17:1s^22s^22p^63s^23p^5[/tex]

Thus it has 7 valence electrons.

B. Magnesium: has atomic number of 12 and has 12 electrons. The electronic configuration is:[tex]Mg:17:1s^22s^22p^63s^2[/tex]

Thus it has 2 valence electrons.

C. Phosphorous: has atomic number of 15 and has 15 electrons. The electronic configuration is:[tex]P:15:1s^22s^22p^63s^23p^3[/tex]

Thus it has 5 valence electrons.

D. Silicon: has atomic number of 14 and has 14 electrons. The electronic configuration is:[tex]Si:15:1s^22s^22p^63s^23p^2[/tex]

Thus it has 4 valence electrons.

E. Sulfur: has atomic number of 16 and has 16 electrons. The electronic configuration is:[tex]Si:15:1s^22s^22p^63s^23p^4[/tex]

Thus it has 6 valence electrons.