Sodium, potassium, strontium, calcium, and magnesium
The english translation of the question is:
Paraffin combustion is a chemical change?
Answer:
Yes
Explanation:
The chemical change is defined as the change in chemical composition of substance while physical change is defined as the change in physical appearance which can return to original shape again.
The combustion of paraffin is a chemical change because during combustion the chemical structure of the paraffin has been changed.
Hence, the given statement is true.
<h2>Answer:</h2>
The correct answer is option C which is, "Electrons in the orbit closest to the nucleus have the least amount of energy".
<h3>
Explanation:</h3>
- There are different orbitals around the nucleus on which the electrons moves around the nucleus.
- These orbitals have a specific energy, due to which they are known as energy levels.
- The energy level near to the nucleus has least amount of the energy and the energy of the orbitals increase as the distance of the orbitals increase to the nucleus.