Elements with the Same Number of Protons and Neutrons

List the elements with the same number of protons and neutrons in their average composition, such that their mass number is twice their atomic number
Quiz by chubdl
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Last updated: September 4, 2021
First submittedSeptember 4, 2021
Times taken15
Average score77.8%
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Elements
Helium
Carbon
Nitrogen
Elements
Oxygen
Neon
Magnesium
Elements
Silicon
Sulfur
Calcium
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