Day 1: Atomic Architecture | Middle Stage Science | Apex Institute of Maths and Sciences

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Day 1: Atomic Architecture ⚛️

Middle Stage Science | APEX EDUTECH SOLUTIONS

🎯 1. Concept: The Three Subatomic Particles

Everything is made of Atoms. An atom has a center called the Nucleus and outer paths called Shells (or Orbits). There are three main particles:

  • Protons: Positively charged particles inside the Nucleus. The number of protons is the Atomic Number.
  • Neutrons: Particles with NO charge (Neutral) inside the Nucleus.
  • Electrons: Negatively charged particles that orbit outside the Nucleus in shells.

*Rule: In a neutral atom, the number of Protons and Electrons are always EQUAL.

💡 2. Atomic Mass and Neutrons

The Mass Number is the total count of Protons and Neutrons added together. We use this to find missing information:

Neutrons = Mass Number – Protons

Isotopes: These are atoms of the same element that have the same number of protons but different numbers of neutrons.

🌍 3. Science in Our Daily Life

Radiation Shielding: Dense atoms like Lead are used to block X-rays because their nuclei contain many protons and neutrons.

Carbon Dating: Scientists use a specific Isotope of Carbon (Carbon-14) to find the age of ancient fossils and wood.

📝 4. Home Practice Task

Task: Study the element Helium. It has an Atomic Number of 2 and a Mass Number of 4. Calculate its neutrons and draw the nucleus.

✅ 5. Day 1 Research Assessment

All answers can be found in the concepts above. Good luck!

Easy
1. Where are Neutrons located in an atom?
Solution: As stated in Part 1, Neutrons and Protons are both inside the Nucleus.
Easy
2. Which subatomic particle has a Positive charge?
Solution: Protons are positively charged (+).
Easy
3. What does the “Atomic Number” represent?
Solution: The number of protons is the Atomic Number (Part 1).
Easy
4. Which particle orbits outside the nucleus in shells?
Solution: Electrons move in outer shells (Part 1).
Medium
5. If a neutral atom has 8 protons, how many electrons does it have?
Solution: In a neutral atom, Protons and Electrons are equal (Rule in Part 1).
Medium
6. Calculation: If an atom has 6 protons and its Mass Number is 14, how many neutrons does it have?
Solution: Neutrons = Mass – Protons (14 – 6 = 8).
Medium
7. What makes one isotope different from another isotope of the same element?
Solution: Isotopes have different numbers of neutrons (Part 2).
Medium
8. Which isotope is used to find the age of fossils?
Solution: Carbon-14 is used for dating fossils (Part 3).
Hard
9. Assertion: The Mass Number is always a whole number.
Reason: It is the sum of the count of protons and neutrons.
Solution: Since you cannot have half a particle, the total count is always a whole number (Part 2).
Hard
10. Why is the Neutron called “Neutral”?
Solution: “Neutral” means it has no electrical charge (Part 1).
⚠️ Please answer all 10 questions!

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