Gold and platinum are both considered noble or precious metals, and they are known for their inertness. They are relatively unreactive and do not readily react with other substances.

Here are a few specific points about the reactivity of gold and platinum:

1. Gold:

- Gold is a noble metal that is highly resistant to corrosion and oxidation.

- It does not react with water or oxygen at room temperature.

- Gold does react with certain chemicals such as chlorine gas (Cl2), bromine (Br2), and aqua regia (a mixture of hydrochloric and nitric acids).

2. Platinum:

- Platinum is also a noble metal and is known for its high resistance to corrosion and oxidation.

- It is less reactive than gold and does not react with most acids and alkalis.

- However, platinum can react with certain substances such as chlorine gas (Cl2), fluorine (F2), and aqua regia.

In contrast to reactive metals like sodium or potassium, which readily react with water, oxygen, and other substances, gold and platinum remain relatively stable and unreactive under normal conditions. This makes them valuable for use in jewelry, electronics, and other applications where corrosion resistance is crucial.