Aluminum and Isotope Concepts

This video tutorial explains how to determine the protons, neutrons, electrons, and mass number for aluminum, focusing on its isotopes. It covers the atomic number, which is consistent across isotopes, and explains the concept of ions. The video also discusses how the number of neutrons varies between isotopes, affecting the mass number. It provides a method to calculate the mass number using the periodic table's average atomic mass. The tutorial highlights the common isotopes of aluminum, particularly aluminum-27, and introduces nuclear notation for representing isotopes.

What is the atomic number of aluminum?

• 15

• 14

• 13

• 12

What does the atomic number of an element represent?

• Number of neutrons

• Mass number

• Number of electrons

• Number of protons

What does it mean when aluminum is written as 'Al' on the periodic table?

• It has a negative charge

• It is an ion

• It has a positive charge

• It is a neutral element

How many electrons does a neutral aluminum atom have?

• 10

• 11

• 12

• 13

What is the main difference between isotopes of the same element?

• Atomic number

• Number of neutrons

• Number of electrons

• Number of protons

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

• Divide mass number by atomic number

• Subtract atomic number from mass number

• Multiply atomic number by mass number

• Add atomic number to mass number

What is the mass number of the most common aluminum isotope?

• 26

• 27

• 29

• 28

What is the nuclear notation for aluminum-27?

• 27/13 Al

• 13/27 Al

• 14/27 Al

• 27/14 Al

What does the average atomic mass on the periodic table represent?

• Mass of the heaviest isotope

• Mass of the lightest isotope

• Mass of the most common isotope

• Average mass of all isotopes

Why can't you determine the number of isotopes from the periodic table?

• It only shows the most common isotope

• It shows the average atomic mass

• It doesn't list isotopes

• It only shows the atomic number