Posted by **timmy123** on Saturday, October 16, 2010 at 3:47pm.

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.

- Chemistry -
**DrBob222**, Saturday, October 16, 2010 at 4:02pm
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**

- Chemistry -
**timmy123**, Saturday, October 16, 2010 at 4:19pm
thanks

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