Consider the two elements, sodium (Na) and magnesium (Mg) , which occupy the same row in the periodic table of elements. Sodium and magnesium atoms have:
A) a different number of orbitals.
B) the same atomic number.
C) different atomic masses.
D) the same number of electrons in their outermost orbitals.
E) different atomic masses and the same number of electrons in their outermost orbitals.
Correct Answer:
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