객관식
Which part of the atom primarily determines how an element interacts in a chemical reaction?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
객관식
How many valence electrons does a neutral atom of beryllium (Be) have?
A
2
B
6
C
8
D
4
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검증된 단계별 안내1
Identify the element in question, which is beryllium (Be).
Determine the atomic number of beryllium, which tells you the total number of electrons in a neutral atom. Beryllium has an atomic number of 4.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of beryllium: \$1s^2 2s^2$. The electrons in the second shell (2s) are the valence electrons.
Count the electrons in the outermost shell (2s), which gives the number of valence electrons for beryllium.
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