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Valence electrons are the electrons in the outermost shell of an atom. They play a crucial role in determining the chemical properties of an element. Here's why:
1. Valence electrons significantly contribute to the mass of the atom: This statement is not entirely accurate. While valence electrons do have a very small mass, it is negligible compared to the overall mass of the atom, which is primarily contributed by the nucleus and inner electrons.
2. Valence electrons determine the atomic number: This statement is incorrect. The atomic number of an element is determined by the number of protons in the nucleus, not by the valence electrons.
3. Valence electrons are the electrons in the outer shell: This statement is correct. Valence electrons are located in the outermost energy level of an atom.
4. Valence electrons determine the chemical properties of an element: This statement is true. The number and arrangement of valence electrons dictate how an atom will interact with other atoms to form chemical bonds, which ultimately influences the chemical properties of an element.
Therefore, the correct statements in the given options are:
- Are the electrons in the outer shell
- Determine the chemical properties of an element
I hope this helps clarify the concept of valence electrons for you! Feel free to ask if you have any more questions.
