An element with atomic number twelve is likely to be…
An element with atomic number twelve is likely to be
A. electrovalent with a valency of 1.
B. electrovalent with a valency of 2.
C. covalent with a valency of 2.
D. covalent with valency of 4.
Atomic number = 12
Electronic configuration of the element = 2, 8, 2
Number of valence electrons = 2
This element will easily form electrovalent bond with a non-metal by losing 2 valence electrons.
Now for the right answer to the above question:
- Option A is incorrect. the electron on the outermost shell is 2 and not 1.
- Option B is correct. electrovalent, and two valence electrons.
- C is incorrect. this is not covalent because the element will readily lose (and not share) its 2 electrons to become positively charged.
- D is not the correct answer. This element has 2 valence electrons and not 4.
You may please note these/this:
- Covalent bonds are mostly formed by elements with 3 or more electrons in their outermost shell.
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/ culled from 2016 JAMB-UTME Chemistry past question 36 /