Fluorine has nine protons and nine electrons. it is in column 17 on the periodic table. how many valence electrons does hydrogen have? 2 5 7 9

Hydrogen has one electron

Explanation:

Hydrogen is the first element in the Periodic Table, so it has only one valence electron.

For elements in Groups 13 to 18, then number of valence electrons equals the Group number – 10.

Fluorine is in Group 17, so it has seven valence electrons.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

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