The Group 1 elements are called the alkali metals.
The table shows information about some of the alkali metals.
| Name | Atomic number | Melting point (∘C^\circ\text{C}∘C) | State at room temperature (20∘C20^\circ\text{C}20∘C) | Chemical symbol |
|---|---|---|---|---|
| Lithium | 3 | 181 | Solid | Li\text{Li}Li |
| Sodium | 11 | 98 | Solid | Na\text{Na}Na |
| Potassium | 19 | 63 | Solid | K\text{K}K |
| Rubidium | 37 | 39 | Solid | Rb\text{Rb}Rb |
Which is the least reactive alkali metal in the table?
Caesium is also an alkali metal. It has the atomic symbol Cs\text{Cs}Cs and an atomic number of 55.
Look at the table.
Predict the state of caesium at 40∘C40^\circ\text{C}40∘C.
Predict the melting point of caesium.
Potassium, K\text{K}K, reacts with chlorine. A white solid is made.
What is the name of this white solid?
Write down the balanced symbol equation for this reaction.
41 exam-style questions on OCR GCSE Chemistry Predicting chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.