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What is the valence electron configuration for the magnesium atom?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons are present in a neutral atom of strontium (Sr)?
A
2
B
4
C
6
D
8
검증된 단계별 안내1
Identify the atomic number of strontium (Sr) from the periodic table, which tells you the total number of electrons in a neutral atom.
Determine the electron configuration of strontium by filling the orbitals in order of increasing energy levels, following the Aufbau principle.
Locate the outermost shell (highest principal quantum number, n) in the electron configuration; the electrons in this shell are the valence electrons.
Count the number of electrons in the outermost shell to find the number of valence electrons in a neutral strontium atom.
Confirm that strontium is in Group 2 of the periodic table, which typically means it has 2 valence electrons.
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