What is an Isotone?

S4-SA2-0337

Grade Level:

Class 6

Space Technology, EVs, Climate Change, Biotechnology, HealthTech, Robotics, Chemistry, Physics

Definition

What is it?

Isotones are atoms of different chemical elements that have the same number of neutrons. Even though they are different elements, they share this specific characteristic of having an equal count of neutrons in their nucleus.

Simple Example

Quick Example

Imagine you have two different types of Ladoos, say a Motichoor Ladoo and a Besan Ladoo. They look different and taste different (like different elements), but both might have exactly 5 cashews inside (like having the same number of neutrons). So, if Motichoor Ladoo has 5 cashews and Besan Ladoo also has 5 cashews, they are 'cashew-equal' or 'isotones' in our example!

Worked Example

Step-by-Step

Let's find if two atoms, Fluorine-19 (F-19) and Neon-20 (Ne-20), are isotones.

Step 1: Understand the given information. Fluorine (F) has an atomic number of 9. Neon (Ne) has an atomic number of 10. The numbers 19 and 20 are their mass numbers.
---Step 2: Recall how to find the number of protons. The atomic number tells us the number of protons. So, Fluorine has 9 protons, and Neon has 10 protons.
---Step 3: Recall how to find the number of neutrons. Number of neutrons = Mass number - Number of protons.
---Step 4: Calculate neutrons for Fluorine-19. Neutrons in F-19 = 19 (mass number) - 9 (protons) = 10 neutrons.
---Step 5: Calculate neutrons for Neon-20. Neutrons in Ne-20 = 20 (mass number) - 10 (protons) = 10 neutrons.
---Step 6: Compare the number of neutrons. Both F-19 and Ne-20 have 10 neutrons.
---Step 7: Check if they are different elements. Yes, Fluorine and Neon are different elements.
---Answer: Since Fluorine-19 and Neon-20 are different elements and both have 10 neutrons, they are isotones.

Why It Matters

Understanding isotones helps scientists in fields like Nuclear Physics and HealthTech to study the stability of atoms and develop new medicines. It's crucial for engineers working on advanced materials and even in understanding how stars produce energy.

Common Mistakes

MISTAKE: Confusing isotones with isotopes. | CORRECTION: Isotopes have the same number of protons (same element) but different neutrons. Isotones have the same number of neutrons (different elements).

MISTAKE: Forgetting that isotones must be different elements. | CORRECTION: The definition of isotones specifically requires them to be atoms of DIFFERENT chemical elements.

MISTAKE: Calculating the number of neutrons incorrectly. | CORRECTION: Always remember: Number of Neutrons = Mass Number - Atomic Number (or number of protons).

Practice Questions

Try It Yourself

QUESTION: An atom X has 6 protons and 8 neutrons. An atom Y has 7 protons and 8 neutrons. Are X and Y isotones? | ANSWER: Yes, because both have 8 neutrons and are different elements (different number of protons).

QUESTION: Carbon-14 (Atomic number 6) and Nitrogen-14 (Atomic number 7). Are they isotones? Explain why or why not. | ANSWER: No, they are not isotones. Carbon-14 has 14 - 6 = 8 neutrons. Nitrogen-14 has 14 - 7 = 7 neutrons. They do not have the same number of neutrons.

QUESTION: Atom P has an atomic number of 11 and a mass number of 23. Atom Q has an atomic number of 12 and a mass number of 24. Calculate the number of neutrons for both and determine if they are isotones. | ANSWER: For Atom P: Neutrons = 23 - 11 = 12. For Atom Q: Neutrons = 24 - 12 = 12. Yes, P and Q are isotones because they are different elements and both have 12 neutrons.

MCQ

Quick Quiz

Which of the following describes isotones?

Atoms of the same element with different numbers of neutrons.

Atoms of different elements with the same number of protons.

Atoms of different elements with the same number of neutrons.

Atoms of the same element with the same number of neutrons.

The Correct Answer Is:

Isotones are defined as atoms of different elements that share the same number of neutrons. Options A and D describe isotopes and identical atoms respectively. Option B describes isobars if mass numbers are also the same, or simply different elements.

Real World Connection

In the Real World

In medical imaging, particularly in technologies like PET scans (Positron Emission Tomography) used to detect diseases, scientists carefully choose specific radioactive isotopes. Understanding neutron counts helps them predict how stable these atoms are and how they will behave in the body, ensuring safe and effective diagnosis.

Key Vocabulary

Key Terms

NEUTRON: A neutral subatomic particle found in the nucleus of an atom. | PROTON: A positively charged subatomic particle found in the nucleus of an atom. | ATOMIC NUMBER: The number of protons in an atom's nucleus, defining the element. | MASS NUMBER: The total number of protons and neutrons in an atom's nucleus. | ELEMENT: A pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei.

What's Next

What to Learn Next

Now that you understand isotones, you should learn about 'Isobars'. Isobars are atoms with the same mass number but different atomic numbers. This will help you see how atoms can be similar in different ways!