Which of the following has the lowest melting point among the alkali metals? (20
Practice Questions
Q1
Which of the following has the lowest melting point among the alkali metals? (2019)
Lithium
Sodium
Potassium
Rubidium
Questions & Step-by-Step Solutions
Which of the following has the lowest melting point among the alkali metals? (2019)
Step 1: Understand what alkali metals are. Alkali metals are a group of elements in the periodic table that include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
Step 2: Know that melting point is the temperature at which a solid becomes a liquid.
Step 3: Look at the melting points of the alkali metals. They generally decrease as you move down the group in the periodic table.
Step 4: Compare the melting points of the alkali metals: Lithium (Li) has a melting point of 180.5 °C, Sodium (Na) has 97.8 °C, Potassium (K) has 63.5 °C, Rubidium (Rb) has 39.3 °C, Cesium (Cs) has 28.5 °C, and Francium (Fr) is not well-studied but is expected to be lower than cesium.
Step 5: Identify that among these, Potassium (K) has the lowest melting point of 63.5 °C.
