Multiple Choice
What happens to the valence electrons in a covalent bond?
10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following have their valence electrons in the same shell?
A
Mg, Al, Cl
B
B, Si, As
C
N, As, Bi
D
He, Ne, F
Verified step by step guidance1
Step 1: Understand the concept of valence electrons. Valence electrons are the electrons in the outermost shell of an atom and are important for determining how an element will react chemically.
Step 2: Identify the electron configuration of each element. This will help you determine the number of valence electrons and the shell they occupy.
Step 3: Write the electron configurations for each element in the options provided. For example, Mg (Magnesium) has an electron configuration of \( \text{[Ne]}3s^2 \), Al (Aluminum) has \( \text{[Ne]}3s^23p^1 \), and Cl (Chlorine) has \( \text{[Ne]}3s^23p^5 \).
Step 4: Determine the valence shell for each element based on their electron configurations. The valence shell is the highest energy level that contains electrons.
Step 5: Compare the valence shells of the elements in each group to see which group has all elements with valence electrons in the same shell. For example, Mg, Al, and Cl all have their valence electrons in the third shell.
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