Sodium Isotopes and Atomic Structure

The video tutorial explains the atomic structure of sodium, focusing on its isotopes, atomic number, and mass number. It details how sodium has one main isotope and two minor isotopes, with an atomic number of 11. The video discusses the neutrality of elements, where protons equal electrons, and how different isotopes have varying numbers of neutrons, affecting their mass number. It also covers how to calculate the number of neutrons and introduces nuclear notation for isotopes like sodium-22, sodium-23, and sodium-24.

What is the atomic number of sodium?

• 13

• 12

• 11

• 10

Why is sodium considered neutral?

• It has equal numbers of protons and electrons.

• It has more protons than electrons.

• It has no neutrons.

• It has more electrons than protons.

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

• 25

• 24

• 23

• 22

How many neutrons are present in the most common sodium isotope?

• 11

• 10

• 13

• 12

How is the mass number of an isotope determined?

• By subtracting neutrons from protons

• By subtracting electrons from protons

• By adding protons and neutrons

• By adding protons and electrons

Which of the following is a trace isotope of sodium?

• Sodium-25

• Sodium-23

• Sodium-22

• Sodium-21

What is the mass number of sodium-24?

• 22

• 23

• 25

• 24

Which isotope of sodium has 13 neutrons?

• Sodium-25

• Sodium-24

• Sodium-22

• Sodium-23

What does the nuclear notation for sodium-23 include?

• Mass number 22 and atomic number 11

• Mass number 23 and atomic number 11

• Mass number 24 and atomic number 11

• Mass number 23 and atomic number 12

What is the atomic number of sodium in nuclear notation?

• 12

• 13

• 11

• 10