Mastering Bohr Models in 5 Minutes

The video provides a quick overview of Bohr models and the periodic table. It explains how elements are organized by atomic number and mass, and introduces Dmitri Mendeleev's role in developing the periodic table. The video details how to calculate the number of protons, electrons, and neutrons in an atom, and how to determine energy levels. It concludes with a step-by-step guide to drawing a Bohr model for sodium, highlighting the arrangement of electrons in different shells.

Who is credited with organizing the elements on the periodic table?

• Albert Einstein

• Dimitri Mendeleev

• Isaac Newton

• Niels Bohr

What does the atomic number of an element represent?

• The atomic mass

• The number of protons and electrons

• The number of electron shells

• The number of neutrons

Tags

NGSS.MS-PS1-1

How is the number of neutrons in an atom calculated?

• By multiplying the atomic number by the atomic mass

• By dividing the atomic mass by the atomic number

• By subtracting the atomic number from the atomic mass

• By adding the atomic number and atomic mass

What is the unit of measurement for atomic mass?

• Grams

• Kilograms

• Milligrams

• Atomic mass units

How many electrons can the first energy level hold?

• 18

• 8

• 32

• 2

Which row of the periodic table indicates the number of electron shells?

• Period

• Column

• Row

• Group

What is the atomic number of sodium?

• 11

• 23

• 18

• 12

How many neutrons does sodium have?

• 23

• 18

• 11

• 12

How many electrons are in the third shell of sodium?

• 11

• 8

• 1

• 2

What is the symbol for sodium?

• So

• Na

• N

• S