Understanding Isotopes and Ions

The video tutorial explains how to identify isotopes using the number of protons, neutrons, and electrons. It uses sulfur and fluorine as examples to demonstrate how to determine the identity of an isotope and calculate its charge. The tutorial emphasizes the importance of the atomic number and mass number in identifying elements and their isotopes.

What defines the identity of an element?

• Mass number

• Number of electrons

• Number of neutrons

• Number of protons

If an element has 16 protons, what is it?

• Nitrogen

• Carbon

• Sulfur

• Oxygen

How do you calculate the mass number of an isotope?

• Subtract electrons from protons

• Add protons and electrons

• Add neutrons and electrons

• Add protons and neutrons

What charge does an ion have if it has more electrons than protons?

• Positive

• No charge

• Negative

• Neutral

What is the charge of a sulfur ion with two extra electrons?

• 1-

• 2+

• 1+

• 2-

What is the atomic number of fluorine?

• 7

• 10

• 8

• 9

How many protons does fluorine have?

• 7

• 8

• 9

• 10

If a fluorine ion has a negative charge, how many electrons does it have?

• 10

• 11

• 9

• 8

How do you determine the number of neutrons in an isotope?

• Subtract protons from electrons

• Add protons and electrons

• Subtract electrons from mass number

• Subtract protons from mass number

What is the mass number of a fluorine isotope with 9 protons and 9 neutrons?

• 19

• 18

• 17

• 16