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  1. Alkali metals group is the very first group (group 1) on the periodic table. The elements included in the Alkali metals group are; Lithium (Li) Sodium (Na) Potassium (K) Rubidium (Rb) Cesium (Cs) Francium (Fr)
    periodictableguide.com/periodic-table-groups/
    a Group 1 is composed of hydrogen (H) and the alkali metals. Elements of the group have one s-electron in the outer electron shell. Hydrogen is not considered to be an alkali metal as it is not a metal, though it is more analogous to them than any other group. This makes the group somewhat exceptional.
    en.wikipedia.org/wiki/Periodic_table
    Hydrogen is the element that is atomic number 1 on the periodic table. The element number or atomic number is the number of protons present in the atom. Each hydrogen atom has one proton, which means it has a +1 effective nuclear charge.
    www.thoughtco.com/atomic-number-1-on-periodic-t…
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  6. Facts About Hydrogen, Atomic #1 on the Periodic Table

    Mar 11, 2019 · Hydrogen is the element that is atomic number 1 on the periodic table. The element number or atomic number is the number of protons present in the atom. Each hydrogen atom has one proton, which means it has a +1 …