Question

9 matching 4 points please match the electron - configuration to the correct element. 2 - 6 2 - 18 - 8 - 1 2 - 7 - 6 2 - 8 - 1 - 1 10 matching 3 points please match the electron - configuration to the correct element. 2 - 8 - 3 - 1 2 - 8 - 17 - 6 2 - 8 - 18 - 8

Explanation:

Step1: Recall electron - configuration rules

The sum of electrons in each configuration gives the atomic number of the element.

Step2: Analyze 2 - 6

The total number of electrons is \(2 + 6=8\). The element with atomic number 8 is oxygen (O).

Step3: Analyze 2 - 18 - 8 - 1

The total number of electrons is \(2+18 + 8+1=29\). The element with atomic number 29 is copper (Cu).

Step4: Analyze 2 - 7 - 6 (This is an incorrect configuration as the second shell can hold a maximum of 8 electrons, assuming it's a mis - write and you meant 2 - 8 - 7 - 6 which is not a valid short - hand either. But if we assume the correct form is 2 - 8 - 7, total electrons \(2 + 8+7 = 17\), element is chlorine (Cl)).

Step5: Analyze 2 - 8 - 1 - 1 (This is an incorrect configuration as the third shell should be filled before starting the fourth shell. Assuming you meant 2 - 8 - 1, total electrons \(2+8 + 1=11\), element is sodium (Na)).

Step6: Analyze 2 - 8 - 3 - 1 (This is an incorrect configuration as the third shell should be filled before starting the fourth shell. Assuming you meant 2 - 8 - 3, total electrons \(2+8 + 3=13\), element is aluminum (Al)).

Step7: Analyze 2 - 8 - 17 - 6 (This is an incorrect configuration as the third shell can hold a maximum of 18 electrons and the filling order is not correct. Assuming you meant 2 - 8 - 18 - 7, total electrons \(2+8 + 18+7=35\), element is bromine (Br)).

Step8: Analyze 2 - 8 - 18 - 8

The total number of electrons is \(2+8 + 18+8=36\), element is krypton (Kr).

Answer:

2 - 6: Oxygen (O)
2 - 18 - 8 - 1: Copper (Cu)
2 - 7 - 6 (assuming 2 - 8 - 7): Chlorine (Cl)
2 - 8 - 1 - 1 (assuming 2 - 8 - 1): Sodium (Na)
2 - 8 - 3 - 1 (assuming 2 - 8 - 3): Aluminum (Al)
2 - 8 - 17 - 6 (assuming 2 - 8 - 18 - 7): Bromine (Br)
2 - 8 - 18 - 8: Krypton (Kr)