Question
4e
2e
Hydrogen (H)
Carbon (C)
Se
2e
Oxygen (0)
* Sodium (Na)
* They all have the same number of protons in their nuclei.
• They are all generally unreactive elements.
• They all have an incomplete valence electron shell.
• They all have the same number of electrons in their first electron shell.
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Answer
They all have the same number of protons in their nuclei, are generally unreactive elements, have an incomplete valence electron shell, and have the same number of electrons in their first electron shell.