Chemistry
A light element in period-3 with a neutron/proton ratio around 1.
Periodic Table
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Answer
Sodium is a stable element having neutron/proton ratio around 1 (approximately).
Reason — No. of protons (p) = 11
No. of neutrons (n) = 23 - 11 = 12
n : p = = 1.09 ≈ 1
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