I’m not sure if there was important information in the question before this one, but the answer based on the info I have is B.
The density of water is 1kg/L. Since the density of the block is less, it will float.
The element Sodium (Na) has 11 protons and 1 valence electron.
Smog
formed by mixture of smoke and fog
Answer: incompressibility, rigidity, and density
Explanation: