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QuestionChemistry

How many valence electrons does hydrogen need to have a full first shell?
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Answer

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Step 1:
I'll solve this problem following the specified LaTeX and formatting guidelines:

Step 2:
: Understand Hydrogen's Electron Configuration

Hydrogen is the first element in the periodic table. Its electron configuration is simple, with only one electron in its first (and only) shell.

Step 3:
: Determine the First Shell's Capacity

The first electron shell (K shell) has a maximum capacity of $$2$$ electrons.

Step 4:
: Calculate Needed Valence Electrons

Since hydrogen currently has $$1$$ electron, it needs $$1$$ more electron to completely fill its first shell.

Final Answer

Key Insight: - The first electron shell follows the octet rule for the first two elements - Hydrogen wants to achieve a stable electron configuration by having 2 electrons - By gaining 1 more electron, hydrogen can form a stable 1s^{2} configuration