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1. what is this element: [Ar] 4s1?

NaLiHK ? 2.WHAT ARE THESE ELEMENTS IN AN INCREASING ORDER OF THERE ATOMIC SIZE.element a 1s2 2s2 2p6element b is2 2s2element c 1s2 2s2 2p6 3s1element d 1s2 2s2 2p33.idk how to do this..calculate the atomic mass of the element x. then use the periodic table to identify the element.isotope mass(amu) percent abundance27x 27.977 92.2328x 28.976 4.67 29x 29.974 3.10

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