Electron Configuration and Valence Electrons

This video tutorial covers the basics of atomic theory, focusing on Niels Bohr's model of the atom. It explains how electrons are arranged in shells around the nucleus and introduces the concept of electron configuration using the 2n^2 rule. The tutorial provides examples of electron configurations for elements like carbon, neon, phosphorus, calcium, and bromine. It also discusses valence electrons, which are the electrons in the outermost shell, and their significance in chemical reactions.

Who proposed the model of the atom where electrons orbit the nucleus in specific paths?

• Niels Bohr

• Isaac Newton

• Ernest Rutherford

• Albert Einstein

According to Bohr's model, what is the maximum number of electrons that can occupy the first shell?

• 8

• 2

• 1

• 4

How many electrons can the second shell hold according to Bohr's theory?

• 4

• 16

• 2

• 8

What is the electron configuration for an element with atomic number 6?

• 2-2-2

• 2-8-6

• 2-8

• 2-4

For an element with atomic number 10, what is the correct electron configuration?

• 2-8-2

• 2-6-2

• 2-8

• 2-2-6

How many electrons are in the third shell of an element with atomic number 15?

• 5

• 10

• 2

• 8

What is the electron configuration for calcium (atomic number 20)?

• 2-8-8-2

• 2-8-10

• 2-8-8

• 2-10-8

For an element with atomic number 35, how many electrons are in the fourth shell?

• 5

• 18

• 2

• 8

What is the valence electron count for carbon?

• 2

• 8

• 6

• 4

How many valence electrons does an element with atomic number 20 have?

• 8

• 6

• 4

• 2