Answer the questions below for an element that has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s1.

A. What is the symbol for this element?
B. What is the atomic number of this element?
C. How many unpaired electrons does an atom of this elelemt have?
D. How many valence electrons does an atom of this elelemt have?
E. How many inner shell electrons does an atom of this element have?
F. What is the highest occupied energy level for this element?

a. Count the electrons. I see 19 which makes this element #19 or K.

You can do the others?

A. The symbol for this element is K.

B. The atomic number of this element is 19.
C. An atom of this element has 1 unpaired electron.
D. An atom of this element has 1 valence electron.
E. An atom of this element has 18 inner shell electrons.
F. The highest occupied energy level for this element is the 4th energy level.

A. The symbol for this element can be determined by looking at the last digit of the electron configuration, which is 4s1. The 4s orbital corresponds to the fourth period on the periodic table. Therefore, the symbol for this element is potassium (K).

B. The atomic number of an element is equal to the number of protons in its nucleus. In this case, since the element is potassium, the atomic number is 19.

C. To determine the number of unpaired electrons, we need to look at the electron configuration. In this case, there is one electron in the 4s orbital, which is unpaired. Therefore, potassium has 1 unpaired electron.

D. Valence electrons are the electrons in the outermost energy level of an atom. In this electron configuration, the outermost energy level is the fourth period (4s1), and the electron in the 4s orbital is the only electron in the outermost level. Therefore, potassium has 1 valence electron.

E. Inner shell electrons are the electrons in the energy levels below the outermost energy level. In this electron configuration, all the electrons in the 1s2, 2s2, 2p6, 3s2, and 3p6 orbitals are inner shell electrons. Counting these electrons, we find that there are a total of 18 inner shell electrons.

F. The highest occupied energy level is the outermost energy level with electrons. In this electron configuration, the highest occupied energy level is the fourth energy level (4s1). Therefore, the highest occupied energy level for potassium is 4.

To answer these questions, you can use the electron configuration provided. Here's how you can find the answers:

A. The symbol for this element can be determined by looking at the configuration of the highest energy level, which in this case is 4s1. The element in Period 4 and Group 1 is potassium (K).

B. The atomic number of an element is the number of protons in its nucleus. In this case, the electron configuration indicates that there are 19 electrons (2+2+6+2+6+1), so the atomic number of this element is 19.

C. To determine the number of unpaired electrons, you need to look at the last electron added to the electron configuration. In this case, the last electron added is in the 4s orbital, and there is only one electron in that orbital. Therefore, there is 1 unpaired electron.

D. Valence electrons are the outermost electrons in an atom. In this electron configuration, the outermost energy level is the fourth energy level, where the 4s1 electron is located. Therefore, there is 1 valence electron.

E. Inner shell electrons are the electrons in the energy levels below the outermost energy level. To determine the number of inner shell electrons, you would need to subtract the number of valence electrons (1 in this case) from the total number of electrons in the electron configuration (19). Therefore, there are 18 inner shell electrons.

F. The highest occupied energy level is the energy level that contains the valence electrons. In this case, the valence electron is in the fourth energy level (4s1). Therefore, the highest occupied energy level for this element is the fourth energy level.

So, to summarize the answers:
A. The symbol for this element is K (potassium).
B. The atomic number of this element is 19.
C. An atom of this element has 1 unpaired electron.
D. An atom of this element has 1 valence electron.
E. An atom of this element has 18 inner shell electrons.
F. The highest occupied energy level for this element is the fourth energy level.