Which of the following statements are true? The element with a ground state elec
ID: 1005989 • Letter: W
Question
Which of the following statements are true?
The element with a ground state electron configuration of 1s22s22p63s2 is an alkaline earth metal.
The ground state electron configuration for the undiscovered element 115 is [Rn]7s25f146d107p3.
The element with a ground state electron configuration of [Kr]5s24d105p5 has 15 valence electrons.
The ground state electron configuration for Cu is [Ar]4s13d10.
The electron configuration of 1s22s22p63s23p64s13d8 is an excited state electron configuration for Ni.
If an element (abbreviated X) has a ground state electron configuration of [Ne]3s23p4, then the formula of the compound that X forms with sodium is Na2X.
Explanation / Answer
The element with a ground state electron configuration of 1s22s22p63s2 is an alkaline earth metal.
Mg = 12 1s22s22p63s2
The ground state electron configuration for the undiscovered element 115 is [Rn]7s25f146d107p3.
The ground state electron configuration for Cu is [Ar]4s13d10.
If an element (abbreviated X) has a ground state electron configuration of [Ne]3s23p4, then the formula of the compound that X forms with sodium is Na2X.
Na+ X-2
Na2X
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