Question

complete the table below. an example of how to fill out the table is in the first row. for the configuration answers, you can not put superscripts (exponents) and thats ok. for the configuration answers, make sure to put spaces after the number of electrons in the orbital. example of the wrong way to answer: 1s22s22p63s23p6 example of the correct way to answer: 1s2 2s2 3s2 3p6 element last electron configuration of element noble gas that comes before last electron of noble gas that comes before electron configuration after the noble gas and last configuration fluorine 2p5 he 1s2 2s2 2p5 phosphorus type yi type yi type you type tin type yi type yi type you type copper type yi type yi type you type technetium type yi type yi type you type strontium type yi type yi type you type neon type yi type yi type you type barium type yi type yi type you type iodine type yi type yi type you type

Explanation:

Step1: Recall electron - configuration rules

Use the Aufbau principle, Pauli - exclusion principle, and Hund's rule to find electron configurations.

Step2: Determine noble - gas core for Phosphorus (P)

Phosphorus has 15 electrons. The noble gas before it is Neon (Ne) with 10 electrons. Ne electron configuration is 1s2 2s2 2p6.

Step3: Find last electron configuration of P

After Ne, we fill 3s and 3p orbitals. So the last electron configuration is 3s2 3p3. The full electron configuration after Ne is 3s2 3p3.

Step4: Determine noble - gas core for Tin (Sn)

Tin has 50 electrons. The noble gas before it is Kr (Krypton) with 36 electrons. Kr electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6.

Step5: Find last electron configuration of Sn

After Kr, we fill 5s, 4d, and 5p orbitals. The last electron configuration is 5s2 4d10 5p2. The full electron configuration after Kr is 5s2 4d10 5p2.

Step6: Determine noble - gas core for Copper (Cu)

Copper has 29 electrons. The noble gas before it is Ar (Argon) with 18 electrons. Ar electron configuration is 1s2 2s2 2p6 3s2 3p6.

Step7: Find last electron configuration of Cu

Due to the stability of a half - filled or fully - filled d - subshell, the electron configuration of Cu is [Ar] 3d10 4s1. So the last electron configuration is 3d10 4s1. The full electron configuration after Ar is 3d10 4s1.

Step8: Determine noble - gas core for Technetium (Tc)

Technetium has 43 electrons. The noble gas before it is Kr with 36 electrons.

Step9: Find last electron configuration of Tc

After Kr, we fill 5s and 4d orbitals. The last electron configuration is 5s2 4d5. The full electron configuration after Kr is 5s2 4d5.

Step10: Determine noble - gas core for Strontium (Sr)

Strontium has 38 electrons. The noble gas before it is Kr.

Step11: Find last electron configuration of Sr

After Kr, we fill 5s orbital. The last electron configuration is 5s2. The full electron configuration after Kr is 5s2.

Step12: Determine noble - gas core for Neon (Ne)

Neon has 10 electrons. There is no noble gas before it in this context for the table's purpose. But if we consider He (2 electrons), the last electron configuration is 2s2 2p6. The full electron configuration after He is 2s2 2p6.

Step13: Determine noble - gas core for Barium (Ba)

Barium has 56 electrons. The noble gas before it is Xe (Xenon) with 54 electrons. Xe electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6.

Step14: Find last electron configuration of Ba

After Xe, we fill 6s orbital. The last electron configuration is 6s2. The full electron configuration after Xe is 6s2.

Step15: Determine noble - gas core for Iodine (I)

Iodine has 53 electrons. The noble gas before it is Kr.

Step16: Find last electron configuration of I

After Kr, we fill 5s, 4d, and 5p orbitals. The last electron configuration is 5s2 4d10 5p5. The full electron configuration after Kr is 5s2 4d10 5p5.

Answer:

Element	Last electron configuration of element	Noble gas that comes before	Last electron of Noble gas that comes before	Electron configuration after the noble gas and last configuration
Tin	5s2 4d10 5p2	Kr	1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6	5s2 4d10 5p2
Copper	3d10 4s1	Ar	1s2 2s2 2p6 3s2 3p6	3d10 4s1
Technetium	5s2 4d5	Kr	1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6	5s2 4d5
Strontium	5s2	Kr	1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6	5s2
Neon	2s2 2p6	He	1s2	2s2 2p6
Barium	6s2	Xe	1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6	6s2
Iodine	5s2 4d10 5p5	Kr	1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6	5s2 4d10 5p5