Question

1. which configuration belongs to

a. 1s²2s²2p¹
b. 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵
c. 1s²2s²2p⁶3s²3p³
d. 1s²2s²2p⁶3s¹

1. given the following orbital diagram, what would the condensed electron configuration be? use your periodic table for reference.

a. ar3s²3p³
b. ne3s²3p³
c. ne3s²3p²
d. none of the above

1. please choose the correct orbital diagram for chlorine.
2. which bohr diagram to the left has 6 s electrons and 6 p electrons?

a. beryllium (b)
b. neon (ne)
c. magnesium (mg)
d. phosphorus (p)

Explanation:

Step1: Recall electron - configuration rules

Electrons fill orbitals in the order 1s, 2s, 2p, 3s, 3p, etc. with a maximum of 2 electrons in an s - orbital and 6 in a p - orbital. Condensed electron - configurations use the noble - gas core notation.

Step2: Analyze question 19

The given orbital diagram has filled 1s, 2s, 2p, 3s orbitals and 3 electrons in the 3p orbital. The noble - gas core before these orbitals is Ne (which has the electron configuration 1s²2s²2p⁶). So the condensed electron configuration is [Ne]3s²3p³.

Step3: Analyze question 20

Chlorine has an atomic number of 17. Its electron configuration is 1s²2s²2p⁶3s²3p⁵. In the orbital diagram, the 1s, 2s, 2p, 3s orbitals are filled (2 electrons in each s - orbital and 6 in each p - orbital), and the 3p orbitals have 5 electrons. According to Hund's rule, the electrons in the 3p orbitals first fill each of the three 3p orbitals singly and then pair up. So there will be one 3p orbital with 1 electron and two 3p orbitals with 2 electrons.

Step4: Analyze question 21

Beryllium has 4 electrons, Neon has 10 electrons (2 in 1s, 2 in 2s, and 6 in 2p), Magnesium has 12 electrons (2 in 1s, 2 in 2s, 6 in 2p, and 2 in 3s), Phosphorus has 15 electrons (2 in 1s, 2 in 2s, 6 in 2p, 2 in 3s, and 3 in 3p). Neon has 2 s - electrons in 1s, 2 s - electrons in 2s, and 6 p - electrons in 2p, for a total of 6 s - electrons and 6 p - electrons.

Answer:

1. b. [Ne]3s²3p³
2. b
3. b. Neon (Ne)