Which of the following statements are true? True False The element with a ground

Question

Which of the following statements are true?

True False  The element with a ground state electron configuration of [Kr]5s24d105p5 has 7 valence electrons.

True False  The ground state electron configuration for the undiscovered element 117 is [Rn]8s26f147d108p5.

True False  The electron configuration of 1s22s22p63s23p64s13d2 is an excited state electron configuration for Ti.

True False  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 False  The ground state electron configuration for Cr is [Ar]4s23d4.

True False  The element with a ground state electron configuration of 1s22s22p63s1 is an alkali metal.

Explanation / Answer

1. [Kr]5s24d105p5 : True : the element is Iodine, and has 7 valence electrons.

2. False

3. False : The electronic configuration of Titanium in excited state is: 1s2 2s2 2p6 3s2 3p6 4s2 3d1 4p1

4. True: The element is sulphur and it will form Na2S

5. False : the electron configuration of Chromium is : [ Ar ] 4s^1 3d^5 :

6. True: this is electronic configuration of sodium.

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