Lithium Ions and Electrons

This video tutorial explains how to determine the number of protons and electrons in a lithium ion (Li+). It begins by identifying lithium on the periodic table and explaining that the atomic number equals the number of protons. For neutral lithium, the number of protons equals the number of electrons. However, in the case of Li+, which is a positively charged ion, there is one less electron than in neutral lithium. The video concludes by summarizing that the atomic number and protons remain the same between ions and neutral elements, but the number of electrons differs.

What is the main focus of this video?

• Learning about chemical reactions

• Calculating protons and electrons in lithium ions

• Understanding the periodic table

• Finding the number of neutrons in lithium ions

What does the atomic number of an element represent?

• The number of neutrons

• The number of protons

• The number of electrons

• The atomic mass

How many protons does neutral lithium have?

• 2

• 3

• 1

• 4

What is the key difference between neutral lithium and lithium ions?

• Atomic mass

• Number of electrons

• Number of neutrons

• Number of protons

For a neutral lithium atom, how does the number of electrons compare to the number of protons?

• It depends on the isotope

• They are equal

• There are more electrons

• There are fewer electrons

What happens to the number of electrons when lithium becomes a positive ion?

• It loses an electron

• It gains an electron

• It loses a proton

• It gains a proton

How many electrons does a lithium ion (Li+) have?

• 1

• 3

• 4

• 2

What is assumed to be present after the plus sign in Li+?

• A two

• A zero

• A one

• A three

What remains unchanged between neutral lithium and lithium ions?

• Atomic mass

• Number of electrons

• Number of neutrons

• Number of protons

What is the main takeaway regarding protons and electrons in lithium ions?

• Neutrons are affected

• Electrons change in ions

• Electrons remain the same

• Protons change in ions