The atomic radius generally decreases as we move from left to right across a period because
A) the number of electrons in the atoms decreases from left to right.
B) the number of protons in the nucleus increases from left to right.
C) the sizes of the orbitals in the energy level decreases as we move from left to right.
D) the number of neutrons in the nucleus remains almost constant as we move from left.to right
Correct Answer:
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