Exploring Electron Shells and Valence Electrons

The video tutorial explains the arrangement of electrons in atoms, using the analogy of the solar system to describe electron orbitals. It details how electron shells are filled based on energy levels, with examples of electron configurations for elements like hydrogen, carbon, sulfur, and calcium. The concept of valence electrons is introduced, highlighting their role in chemical bonding. The periodic table's organization by proton numbers is also discussed, setting the stage for future lessons on bonding.

What is the area called where electrons move randomly around the nucleus?

• Proton

• Energy level

• Shell

• Orbital

Which shell is always filled first in an atom?

• Third shell

• Second shell

• First shell

• Fourth shell

How many electrons can the second shell hold at most?

• 8

• 2

• 4

• 6

What is the electron configuration of carbon?

• 2, 8, 8, 2

• 2, 4

• 2, 8

• 2, 8, 6

Tags

NGSS.MS-PS1-1

For an element with atomic number 16, what is the electron configuration?

• 2, 8, 8, 2

• 2, 8, 8

• 2, 8, 6

• 2, 4

What are the electrons in the outermost shell of an atom called?

• Core electrons

• Valence electrons

• Protons

• Neutrons

How many valence electrons does carbon have?

• 6

• 2

• 8

• 4

How are elements arranged in the periodic table?

• By increasing proton numbers

• By increasing neutron numbers

• By increasing atomic mass

• By increasing electron numbers

How many rows of elements, called periods, are there in the periodic table?

• 6

• 8

• 5

• 7

What is the process called where valence electrons join together to form stable compounds?

• Fusion

• Electrolysis

• Bonding

• Ionization