Which of the following represents an element?соH2CO302ОН-
1 answer:
Answer:
Co (assuming there's a typo in not capitalizing the first letter)
Explanation:
The elements are depicted in the periodic table. Those are fundamental atoms that are not bonded to anything else but exist in their natural states without forming a bond with anything. That said, we're interested in a monoatomic species listed (the species which consist from only one single atom).
Out of all the choices, we have Co, cobalt, which is a single atom and can be found as an element with the atomic number 27.
Carbonic acid, , consists of 3 different elements: hydrogen (atomic number of 1), carbon (atomic number of 6) and oxygen (atomic number of 8). It's a compound rather than an element, as it consists of several atoms bonded together.
Oxygen, , is also a molecule. It consists of more than a single atom, even though the two atoms are identical. We have a compound, oxygen gas, which consists of two same oxygen (O) atoms (or elements).
Hydroxide anion, , also consists of two elements: oxygen and hydrogen. It also contains a charge on it, so rather than being a molecule, this is now an ion. Since it consists of more than a single atom, this is not an element as well.
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Work arriving at total valence electrons are 24
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Calculating the work arrival at total valence electrons
We know 1 bond contains
2 valence electrons
Here CCl4 contains 4 bonds that is 8 valence electrons
Therefore ,
Total valence electrons are 32
Now valence electrons remain after bond formation =
32 - 8
=24 valence electrons
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Molecular image and lewis hand drawn structure is as shown below
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