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

Na

Li

H

K ?

2.WHAT ARE THESE ELEMENTS IN AN INCREASING ORDER OF THERE ATOMIC SIZE.

element a 1s2 2s2 2p6

element b is2 2s2

element c 1s2 2s2 2p6 3s1

element d 1s2 2s2 2p3

3.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 abundance

27x 27.977 92.23

28x 28.976 4.67

29x 29.974 3.10

2 Answers

  • 1. K, potassium

    1. a. Neon

      b. Beryllium

      c. Sodium

      d. Nitrogen

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  • Ar 4s1

    Source(s): https://owly.im/a7UX4

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