Which of the following is a soft metal that ignites in air and reacts violently with water and has a...........

General Science (CHSL) Chemistry

Which of the following is a soft metal that ignites in air and reacts violently with water and has atomic number 37 in the

periodic table?

This questions was previously asked in

SSC CHSL 7th June 2022 Shift-1

Caesium

Francium

Gallium

Rubidium

Let’s break it down:

- Rubidium (Option 4) is a soft, silvery metal from the alkali family.

- Its atomic number is 37.

- It catches fire in air and reacts explosively with water.

- Caesium (Option 1) is similar—also soft and even more reactive, but its atomic number is 55.

- Francium (Option 2) is extremely rare and radioactive—atomic number 87. Not much lab chemistry happens with it.

- Gallium (Option 3) is soft—but it’s not very reactive, and its atomic number is 31. Plus, it doesn’t behave like the alkali metals.

So the answer with all the clues lining up is:

Option 4—Rubidium

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