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Elements in the first row are filling their 1s orbitals. Since hydrogen is the first element, its electron configuration is 1s1 . It has only one electron in its valence shell. Valence electrons are the outermost electrons or electrons in the largest energy level.

Answer:

Hydrogen's valence number is 1

Explanation:

because it has only one valence electron and needs only one shared electron to fill its energy levels. This means it can bond with many elements. For example, four hydrogen atoms can bond with a carbon atom, which has four valence electrons, to form methane.

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