Chemistry

Did I answer these correctly?

1. What is the total number of principal energy levels or shells in an atom with an atomic number of 30?

a. 3
b. 4
c. 5
d. 6

I choose b.

2. The electron configuration of an atom in the ground state is 2-4. The total number of occupied principal energy levels in this atom is

a. 1
b. 2
c. 3
d. 4

I choose b.

3. In an atom that has an electron configuration of 2-7, what is the total number of electrons in its principal energy level of highest energy?

a. 2
b. 5
c. 6
d. 7

I choose a.

21. What is the total number of occupied principal energy levels in an atom of 11Na?

a. 1
b. 2
c. 3
d. 4

I choose c.

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  1. 1. What is the total number of principal energy levels or shells in an atom with an atomic number of 30?

    a. 3
    b. 4
    c. 5
    d. 6

    I choose b.
    Correct.

    2. The electron configuration of an atom in the ground state is 2-4. The total number of occupied principal energy levels in this atom is

    a. 1
    b. 2
    c. 3
    d. 4

    I choose b.
    I don't know what 2-4 or 2-7 means. If it means 2 electrons in n = 1 and 4 in n = 2, then b is correct.

    3. In an atom that has an electron configuration of 2-7, what is the total number of electrons in its principal energy level of highest energy?

    a. 2
    b. 5
    c. 6
    d. 7

    I choose a.
    a is correct if that means 2 electrons in n = 1 and 7 in n = 2.


    21. What is the total number of occupied principal energy levels in an atom of 11Na?

    a. 1
    b. 2
    c. 3
    d. 4

    I choose c.
    Correct

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  2. thanks

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  3. 3 is incorrect. It would be d or 7 because that’s the highest energy principal energy level(the farthest from the nucleus). 7 is the number of electrons in the second principal energy level and the second principal energy level has a higher energy level ( the first principal energy level has the lowest)

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