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Which of the following statements are true?

A. The element with a ground state electron configuration of 1s22s22p63s2 is an alkaline earth metal.
B. The ground state electron configuration for the undiscovered element 115 is (Rn)7s25f146d107p3.
C. The element with a ground state electron configuration of (Kr)5s24d105p5 has 15 valence electrons.
D. The ground state electron configuration for Cu is (Ar)4s13d10.
E. The electron configuration of 1s22s22p63s23p64s13d8 is an excited state electron configuration for Ni.
F. 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.

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Answer: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. True

The element with a ground state electron configuration of 1s22s22p63s2 is an alkaline earth metal. True

The element with a ground state electron configuration of (Kr)5s24d105p5 has 15 valence electrons. True

The ground state electron configuration for Cu is (Ar)4s13d10. True

Explanation:

The ground state electron configuration for the undiscovered element 115 is (Rn)7s25f146d107p3. Is not the correct electron configuration for the element moscovium. It is no longer undiscovered but is now well known. The correct electron configuration is Moscovium: [Rn]5f14 6d10 7s2 7p3 OR

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 5f14 6d10 7s2 7p3.

The electron configuration of 1s22s22p63s23p64s13d8 is an excited state electron configuration for Ni.. This statement has to be false because the excited electron must be promoted to a higher energy level. Which was not reflected in the configuration written above.

dsdrajlin

Regarding electron configuration, it is true that

  • A. The element with a ground state electron configuration of 1s² 2s² 2p⁶ 3s² is an alkaline earth metal.
  • B. The ground state electron configuration for the undiscovered element 115 is (Rn) 7s² 5f¹⁴ 6d¹⁰ 7p³.
  • D. The ground state electron configuration for Cu is (Ar) 4s¹ 3d¹⁰.
  • F. If an element (abbreviated X) has a ground state electron configuration of (Ne) 3s² 3p⁴, then the formula of the compound that X forms with sodium is Na₂X.

Which of the following statements are true?

  • A. The element with a ground state electron configuration of 1s² 2s² 2p⁶ 3s² is an alkaline earth metal.

YES. Elements with the differential electron in the orbital s² are alkaline earth metals.

  • B. The ground state electron configuration for the undiscovered element 115 is (Rn) 7s² 5f¹⁴ 6d¹⁰ 7p³.

YES. The ground state electron configuration for the element 115 (now known as Moscovium) is (Rn) 7s² 5f¹⁴ 6d¹⁰ 7p³.

  • C. The element with a ground state electron configuration of (Kr) 5s² 4d¹⁰ 5p⁵ has 15 valence electrons.

NO. It has 7 valence electrons, 2 from 5s and 5 from 5p.

  • D. The ground state electron configuration for Cu is (Ar) 4s¹ 3d¹⁰.

YES. This electron configuration provides copper with additional stability.

  • E. The electron configuration of 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁸ is an excited state electron configuration for Ni.

NO. Nickel has 28 electrons and this electron configuration only shows 27.

  • F. If an element (abbreviated X) has a ground state electron configuration of (Ne) 3s² 3p⁴, then the formula of the compound that X forms with sodium is Na₂X.

YES. X has 6 valence electrons (2 from 3s and 4 from 3 p), so to complete its octet, it will form the anion X²⁻. Na⁺ and X²⁻ form the ionic compound Na₂X.

Regarding electron configuration, it is true that

  • A. The element with a ground state electron configuration of 1s² 2s² 2p⁶ 3s² is an alkaline earth metal.
  • B. The ground state electron configuration for the undiscovered element 115 is (Rn) 7s² 5f¹⁴ 6d¹⁰ 7p³.
  • D. The ground state electron configuration for Cu is (Ar) 4s¹ 3d¹⁰.
  • F. If an element (abbreviated X) has a ground state electron configuration of (Ne) 3s² 3p⁴, then the formula of the compound that X forms with sodium is Na₂X.

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