Chemistry, 27.07.2019 18:00 destinywashere101

How many electrons does a co atom have in its 3d subshell?

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Co is the symbol for element cobalt. Atomic number of Co is 27.
1st shell has s orbital and can hold up to 2 electrons.
2nd shell has s and p orbital and can hold upto 8 electrons
3rd shell has s, p and d orbital and can hold upto 18 electrons
In Co electronic configuration upto p orbital in 3rd energy shell is
1s² 2s² 2p⁶ 3s² 3p⁶
After 3p orbital, electrons start filling in the s orbital in 4th energy shell as 4s orbital has lower energy than 3d therefore it fills 4s before 3d, after it fills 2 electrons in 4s, remaining electrons fill 3d orbital

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷
in the 3d subshell there are 7 electrons

Answer from: Quest

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form( $n_2$ ) .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

Answer from: Quest

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