Answer:Strontium-90 and cesium-137 have half-lives of about 30 years (half the radioactivity will decay in 30 years). Plutonium-239 has a half-life of 24,000 years. High-level wastes are hazardous because they produce fatal radiation doses during short periods of direct exposure.
Explanation:
Answer: Option (1) is the correct answer.
Explanation:
Oxygen, sulfur, selenium and tellurium are all group 8 elements. As we go gown the group there will be decrease in electronegativity of atoms.
Also, more is the electronegativity of an atom more it will attract the electrons towards itself. This will result in the formation of partial charges on the combining atoms. Thus, the molecule becomes polar.
Here, oxygen is the most electronargative out of the given options, so it will attract the electrons more towards itself. Hence, it will have the strongest hydrogen bonding at STP.
Answer:
True
Explanation:
The physical and chemical properties of a substance depend on the nature of intermolecular forces between its molecules. For instance, water has a high boiling point because of hydrogen bonding between water molecules. Liquid water is denser than ice because of the difference in the nature of hydrogen bonding in liquid water and ice.
Answer: c
Herbivore that feeds on primary consumers
Explanation: