Electron Configurations and Valence Electrons

Dr. B introduces electron configurations, demonstrating how to write them using the periodic table. The video covers steps for determining electron configurations, practice exercises, understanding valence electrons, and writing configurations for ions. It also explains condensed configurations and exceptional cases like chromium and copper. The video emphasizes patterns in the periodic table and offers downloadable guides for further practice.

What is the atomic number of sulfur, and how does it relate to its electron configuration?

• 16, it indicates the number of protons and electrons in a neutral atom.

• 8, it indicates the number of protons and electrons in a neutral atom.

• 6, it indicates the number of protons and electrons in a neutral atom.

• 32, it indicates the number of protons and electrons in a neutral atom.

Which method is NOT mentioned as a way to determine electron configurations?

• Using a diagonal chart

• Using a video tutorial

• Using a molecular model

• Using the periodic table

What is the electron configuration ending for cesium?

• 6s1

• 3s1

• 4p6

• 5d10

How many valence electrons does oxygen have?

• 8

• 4

• 2

• 6

Which group on the periodic table is known for having elements with seven valence electrons?

• Group 1

• Group 17

• Group 18

• Group 2

What happens to the electron configuration of sodium when it loses one electron?

• It gains one electron in the 3s orbital.

• It loses one electron from the 3s orbital.

• It loses one electron from the 2p orbital.

• It gains one electron in the 2p orbital.

How does the electron configuration of a chloride ion differ from a neutral chlorine atom?

• It has one less electron in the 2p orbital.

• It has one more electron in the 2p orbital.

• It has one less electron in the 3p orbital.

• It has one more electron in the 3p orbital.

What is the condensed electron configuration for phosphorus?

• [Ne] 3s2 3p3

• [Ar] 3s2 3p3

• [He] 2s2 2p3

• [Ne] 3s2 3p1

Which noble gas is used as a reference for the condensed electron configuration of bromine?

• Neon

• Argon

• Xenon

• Krypton

Which elements are known for having exceptional electron configurations?

• Carbon and Nitrogen

• Sodium and Magnesium

• Chromium and Copper

• Sulfur and Oxygen