Exploring Bohr Models in Depth

The video tutorial explains the Bohr model, developed by Niels Bohr in 1913, which depicts electrons orbiting the nucleus like a solar system. It introduces the concept of energy levels and the 2-8-8 rule for elements with atomic numbers 20 and below. The tutorial provides step-by-step instructions for drawing Bohr models, using examples of elements like boron, lithium, chlorine, and silicon. It also touches on the concept of valence electrons and their significance in determining element properties.

Who developed the Bohr model and in which year?

• Niels Bohr in 1913

• Albert Einstein in 1905

• James Chadwick in 1932

• Ernest Rutherford in 1911

What does each ring in the Bohr model represent?

• A different type of molecule

• A different type of proton

• A different level of energy

• A different type of atom

How many electrons can the first energy level hold according to the 2-8-8 rule?

• 8 electrons

• 4 electrons

• 18 electrons

• 2 electrons

What are the electrons in the outermost energy level called?

• Valence electrons

• Core electrons

• Bonding electrons

• Free electrons

How many protons does Boron have?

• 7 protons

• 9 protons

• 5 protons

• 3 protons

Which element has three protons and is represented by the symbol Li?

• Lithium

• Boron

• Carbon

• Oxygen

Tags

NGSS.MS-PS1-1

What is the atomic number of Chlorine?

• 35

• 14

• 20

• 17

How do you calculate the number of neutrons in an element?

• Divide the atomic mass by the atomic number

• Multiply the atomic number by the atomic mass

• Add the atomic number to the atomic mass

• Subtract the atomic number from the atomic mass

How many valence electrons does Chlorine have?

• 17

• 7

• 2

• 8

What is the rule for drawing elements above 20?

• 2-8-18-18

• 2-8-8-32

• 2-8-18-32

• 2-8-8-18