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Selenium has six valence electrons. What is the most common valence of selenium in its compounds?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does a helium (He) atom have?
A
8
B
2
C
1
D
0
Guida verificata passo dopo passo1
Identify the element in question, which is helium (He).
Recall that valence electrons are the electrons in the outermost shell of an atom.
Determine the electron configuration of helium. Since helium has an atomic number of 2, it has 2 electrons.
Recognize that helium's electrons fill the first shell (1s orbital), which is also its outermost shell.
Conclude that helium has 2 valence electrons because both electrons are in its only shell.
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