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Atomic Structure, Isotopes & Periodic Table Trends (WAEC/JAMB) ⚗️
SSS 1 - 3Subatomic Particles and Quantum Orbitals•Module 1 • Lesson 1•Est. 25 mins
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Section 1 of 3
Subatomic Particles & Isotopic Notation
### Representation of an Atom:
$$_Z^A X$$
* **$A$ (Mass Number)** = Protons + Neutrons
* **$Z$ (Atomic Number)** = Protons (identifies the element)
* **Neutrons ($n$)** = $A - Z$
#### Isotopy:
Phenomenon whereby atoms of the same element have the same atomic number $Z$ but different mass numbers $A$ due to difference in number of neutrons.
* *Example*: Chlorine exists as $^{35}_{17}\text{Cl}$ ($75\%$) and $^{37}_{17}\text{Cl}$ ($25\%$).
$$A_r = \frac{(35 \times 75) + (37 \times 25)}{100} = 35.5$$
Core Takeaway: Isotopes possess identical chemical properties because they have identical electron configurations.
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Dr. (Mrs.) Adebayo
Senior Secondary & WAEC/JAMB Senior Fellow
Teacher Emeka•12:25 PM
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