Question

q1 chemistry: u2l10.5 annotating periodic table date: teacher: uncommon schools charge nurse directions: read the passage below. pre - work part 2: electron configuration preparation words. then answer the questions. as you read, annotate the important information and vocabulary part 1: read and annotate step - by - step process electron configuration shows how electrons are arranged in an atom. understanding it helps us predict how atoms interact with chemical reactions. this guide walks you through the basics step by step. 1. find the atomic number: this tells you how many electrons the atom has (for a neutral atom). 2. know the order of filling: electrons fill from lowest to highest energy levels based on the aufbau principle. 3. use the orbital diagram: follow the path: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, etc. 4. fill orbitals according to capacity: s = 2, p = 6, d = 10, f = 14. 5. write the configuration & check: keep adding electrons until you reach the atomic number. (note: if you add the exponents, it should equal the number of electrons that you calculated in step 1). orbital filling diagram below is the order in which orbitals are filled. follow the arrows when writing the configuration. stop when you have used up the electrons for that element. 1s→2s→2p→3s→3p→4s→3d→4p→5s→4d→5p→6s→4f→5d→6p→7s examples of electron configuration of neutral atoms helium (atomic number 2 = 2e⁻) configuration: 1s² oxygen (atomic number 8 = 8e⁻) configuration: 1s²2s²2p⁴ sodium (atomic number 11 = 11e⁻) configuration: 1s²2s²2p⁶3s¹ check: 2 + 2+6 + 1 = 11e⁻ calcium (atomic number 20 = 20e⁻) configuration: 1s²2s²2p⁶3s²3p⁶4s² check: 2 + 2+6 + 2+6 + 2 = 20e⁻ part 2: multiple choice questions 1. what is the electron configuration of neon? a. 1s²2s²2p⁶ b. 1s²2s²2p⁵ c. 1s²2s²3p⁶ d. 1s²2p⁶3s² 2. which element has the configuration 1s²2s²2p⁶3s²3p⁶? a. argon b. sodium c. fluorine d. magnesium part 3: true or false 1. oxygens electron configuration is 1s²2s²2p⁶. 2. potassium ends in a 4s¹ configuration. 3. sodium has more electrons than neon. 4. the electron configuration of carbon is 1s²2s²2p². 5. helium has the same electron configuration as hydrogen. 6. the 3p orbital can hold up to 10 electrons. 7. electron configurations follow a specific filling order called the aufbau principle. 8. the 2p orbital is filled before the 3s orbital.

Explanation:

Step1: Recall electron - configuration rules

Electrons fill orbitals from lowest to highest energy levels following the Aufbau principle: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, etc. with s = 2, p = 6, d = 10, f = 14 electrons capacity per orbital type.

Step2: Find atomic number of Neon

Neon has an atomic number of 10.

Step3: Write electron - configuration of Neon

Filling electrons according to the order, we get \(1s^{2}2s^{2}2p^{6}\).

Step4: Analyze multiple - choice question 1

The correct electron - configuration of Neon is \(1s^{2}2s^{2}2p^{6}\), so the answer for question 1 is A.

Step5: Analyze multiple - choice question 2

Count electrons in \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}\). \(2 + 2+6 + 2+6=18\). Argon has an atomic number of 18, so the answer for question 2 is A.

Step6: Analyze True - or - False questions

1. Oxygen has an atomic number of 8. Its electron - configuration is \(1s^{2}2s^{2}2p^{4}\), not \(1s^{2}2s^{2}2p^{6}\), so it is False.
2. Potassium has an atomic number of 19. Its electron - configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}\), so it is True.
3. Sodium has an atomic number of 11 and Neon has an atomic number of 10. Sodium has more electrons, so it is True.
4. Carbon has an atomic number of 6. Its electron - configuration is \(1s^{2}2s^{2}2p^{2}\), so it is True.
5. Helium has 2 electrons (\(1s^{2}\)) and Hydrogen has 1 electron (\(1s^{1}\)), so it is False.
6. The 3p orbital can hold up to 6 electrons, not 10, so it is False.
7. Electron configurations follow the Aufbau principle, so it is True.
8. The 2p orbital is filled before the 3s orbital according to the Aufbau principle, so it is True.

Answer:

Multiple - Choice Question 1: A. \(1s^{2}2s^{2}2p^{6}\)
Multiple - Choice Question 2: A. Argon
True - or - False Question 1: False
True - or - False Question 2: True
True - or - False Question 3: True
True - or - False Question 4: True
True - or - False Question 5: False
True - or - False Question 6: False
True - or - False Question 7: True
True - or - False Question 8: True