Examples of elements with large atomic radius

📚 Quick Study Guide

• ⚛️ Atomic radius is the distance from the nucleus to the outermost electron.
• ➡️ Atomic radius generally increases as you move down a group (column) in the periodic table due to the addition of electron shells.
• ⬅️ Atomic radius generally decreases as you move from left to right across a period (row) in the periodic table because of increasing nuclear charge.
• 🛡️ Shielding effect: Inner electrons shield outer electrons from the full nuclear charge. More inner electrons = greater shielding = larger atomic radius.
• ➕ Cations (positive ions) are smaller than their parent atoms.
• ➖ Anions (negative ions) are larger than their parent atoms.
• 📏 Measured in picometers (pm) or Angstroms (Å). $1 Å = 10^{-10} m$

🧪 Practice Quiz

1. Which of the following elements has the largest atomic radius?
   1. Fluorine (F)
   2. Chlorine (Cl)
   3. Bromine (Br)
   4. Iodine (I)
2. Which of the following elements has the largest atomic radius?
   1. Sodium (Na)
   2. Magnesium (Mg)
   3. Aluminum (Al)
   4. Silicon (Si)
3. Which of the following ions has the largest radius?
   1. $Na^+$
   2. $Mg^{2+}$
   3. $O^{2-}$
   4. $F^-$
4. Which of the following elements has the largest atomic radius?
   1. Lithium (Li)
   2. Beryllium (Be)
   3. Boron (B)
   4. Carbon (C)
5. Which of the following elements has the largest atomic radius?
   1. Potassium (K)
   2. Calcium (Ca)
   3. Gallium (Ga)
   4. Germanium (Ge)
6. Which of the following has the largest atomic radius?
   1. $S^{2-}$
   2. $Cl^-$
   3. Argon (Ar)
   4. $K^+$
7. Which of the following elements has the largest atomic radius?
   1. Oxygen (O)
   2. Sulfur (S)
   3. Selenium (Se)
   4. Tellurium (Te)