Chemistry, 12.12.2020 16:20 benjaminmccutch
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Oxygen
Calcium
Boron
Neon
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Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z
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PLEASE HELP
This picture represents a model of:
Question 5 options:
Oxygen<...
Question 5 options:
Oxygen<...
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