Question

Consider the following statements:

1. Radon is the heaviest gas.

2. Astatine is a rarer element on Earth.

3. Graphite is an allotrope of carbon.

Which among the above statement(s) is/are correct?

1. 1 and 2
2. 1 and 3
3. Only 3
4. All of the above

Answer 1

Correct Answer - Option 4 : All of the above

The correct answer is All of the above.

• Radon is a chemical element with the symbol Rn and atomic number 86.
  • It is a radioactive, colorless, odorless, tasteless noble gas.
    • It is the heaviest gas.
• Astatine is a chemical element with the symbol At and atomic number 85.
  • It is the rarest naturally occurring element in the Earth's crust, occurring only as of the decay product of various heavier elements.
• Graphite on the other hand, although also only made up of carbon atoms, is the only non-metal that can conduct electricity.
  • This is because only 3 of the available valence electrons form covalent bonds leaving 1 spare electron, which then becomes Delocalised.
  • It is an allotrope of Carbon.
• Hence, option 4 is correct.