According to the Bohr model, how many valence electrons does C have?

Question

BlackTom AI · Accepted Answer

Let's approach this by identifying carbon's electronic structure in the Bohr model framework.
First, note that carbon has atomic number 6, so it has 6 electrons to place in shells.
In the Bohr model, electrons fill shells in order: the first shell can hold up to 2 electrons, and the second shell can hold up to 8, but with only 6 total electrons, after placing 2 in the first shell, the remaining 4 go into the second shell.
The valence electrons are defined as those in the outermost (highest) energy level, which for carbon is the second shell in this arrangement.
Therefore, the number of valence electrons in carbon, according to this model, is 4.
This aligns with the common chemical understanding that carbon forms four bonds due to having four electrons available in its outer shell.
Note: If you tried to count electrons in the first shell, you would be looking at the core that is not involved in valence bonding, which is why those 2 electrons are not considered valence electrons here.

CHEM1011 (ND) Lecture quiz: Week 2

According to the Bohr model, how many valence electrons does C have?

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