Examples of Alkali Metals in Group 1

📚 Quick Study Guide

• ⚛️ Alkali metals are in Group 1 of the periodic table.
• 🔥 They are highly reactive due to having only one valence electron.
• ✨ Reactivity increases as you go down the group (Li < Na < K < Rb < Cs < Fr).
• 💧 They react vigorously with water to produce hydrogen gas and a metal hydroxide. $2M(s) + 2H_2O(l) \rightarrow 2MOH(aq) + H_2(g)$ where M represents the alkali metal.
• 🌡️ They have low melting and boiling points compared to other metals.
• 🪙 They are soft, silvery-white metals.
• 💡 Examples include Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr).

🧪 Practice Quiz

1. Which of the following is NOT an alkali metal?
   1. Lithium (Li)
   2. Sodium (Na)
   3. Calcium (Ca)
   4. Potassium (K)
2. What is the general formula for the reaction of an alkali metal with water?
   1. $M(s) + H_2O(l) \rightarrow MOH(aq) + H_2(g)$
   2. $2M(s) + H_2O(l) \rightarrow 2MOH(aq) + H_2(g)$
   3. $2M(s) + 2H_2O(l) \rightarrow 2MOH(aq) + H_2(g)$
   4. $M(s) + 2H_2O(l) \rightarrow MOH(aq) + H_2(g)$
3. Which alkali metal is the MOST reactive?
   1. Lithium (Li)
   2. Sodium (Na)
   3. Cesium (Cs)
   4. Potassium (K)
4. What is a common physical property of alkali metals?
   1. High density
   2. High melting point
   3. Soft and silvery-white
   4. Poor conductors of electricity
5. What is the number of valence electrons in alkali metals?
   1. 2
   2. 7
   3. 1
   4. 8
6. Which alkali metal is used in batteries?
   1. Sodium (Na)
   2. Lithium (Li)
   3. Potassium (K)
   4. Rubidium (Rb)
7. Why are alkali metals so reactive?
   1. They have a full outer electron shell.
   2. They have a strong attraction for electrons.
   3. They readily lose one electron to form a stable ion.
   4. They are noble gases.