Identifying Elements and Electron Configurations

This video tutorial explains how to identify elements using electron configurations and noble gas notation. It begins with a basic example using oxygen and progresses to more complex examples, including magnesium, phosphorus, and chromium. The tutorial also covers noble gas notation with examples involving neon, chlorine, argon, and krypton. By adding the exponents in the electron configuration, viewers can determine the atomic number and identify the corresponding element using the periodic table.

What is the first step in identifying an element from its electron configuration?

• Add the exponents

• Look for the element symbol

• Check the element's color

• Find the mass number

What is the significance of the atomic number in identifying elements?

• It indicates the number of neutrons

• It shows the number of electrons in the outer shell

• It represents the mass of the element

• It is the number of protons in the nucleus

Which element corresponds to the electron configuration 1s2 2s2 2p6 3s2?

• Nitrogen

• Carbon

• Magnesium

• Oxygen

What is the atomic number of phosphorus?

• 18

• 12

• 20

• 15

Which element has the electron configuration ending in 3d5?

• Manganese

• Cobalt

• Iron

• Chromium

How do you identify an element using noble gas notation?

• Multiply the exponents by the atomic number

• Subtract the atomic number of the noble gas

• Add the atomic number of the noble gas to the exponents

• Find the mass number of the noble gas

What is the atomic number of chlorine when using noble gas notation?

• 20

• 25

• 17

• 10

Which noble gas is used in the notation for chlorine?

• Argon

• Krypton

• Xenon

• Neon

Which element corresponds to the noble gas notation [Ar] 4s2 3d8?

• Iron

• Nickel

• Zinc

• Copper

What is the atomic number of cadmium using noble gas notation?

• 48

• 36

• 40

• 50