Group 4A (or 14) elements have _________ electrons in their valence shell. A. 2 B. 3 C. 4 D. 5
2 answers:
Answer: Option (C) is the correct answer.
Explanation:
Elements of group 4A include carbon, silicon, germanium, tin and lead.
Also, it is known that valence shell is the shell which is present in the outermost side of an element.
Hence, the electrons present in this outermost shell are known as valence electrons.
For example, atomic number of carbon is 6 and its electronic configuration is .
This means that there are 4 electrons present in the outermost shell.
Thus, we can conclude that group 4A (or 14) elements have 4 electrons in their valence shell.
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Answer: The statement, average kinetic energy of the gas particles is greater in container A because its particles move faster is correct.
Explanation:
Kinetic energy is the energy obtained due to the motion of an object or substance.
where,
T = temperature
This means that kinetic energy is directly proportional to temperature.
So, when heat is provided to container A then its molecules will start to move rapidly from one place to another which will cause more collisions between the atoms.
Hence, average kinetic energy will be more in container A.
Whereas container B is placed at room temperature which is low than that in container A. So, molecules in container B will move at almost same speed and therefore, specific collisions will be there. So, average kinetic energy in container B will be less than that in container A.
Thus, we can conclude that the statement, average kinetic energy of the gas particles is greater in container A because its particles move faster is correct.