Question

question 36 (2 points)
how many electrons are in the highest occupied energy level of a neutral chlorine atom?
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question 37 (2 points)
how many electrons are in the highest occupied energy level of a neutral strontium atom?
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question 38 (2 points)
how many electrons are in the highest occupied energy level of copper?
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question 39 (2 points)
how many electrons are there in the highest occupied energy level of atoms in group 5a elements?
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Explanation:

Question 36

Step1: Determine the electron configuration of chlorine

Chlorine has an atomic number of 17. Its electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}\). The highest occupied energy level is the third energy level (\(n = 3\)).

Step2: Count electrons in the highest energy level

In the third energy level (\(3s^{2}3p^{5}\)), the number of electrons is \(2 + 5=7\).

Question 37

Step1: Determine the electron configuration of strontium

Strontium has an atomic number of 38. Its electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}\). The highest occupied energy level is the fifth energy level (\(n = 5\)).

Step2: Count electrons in the highest energy level

In the fifth energy level (\(5s^{2}\)), the number of electrons is \(2\).

Question 38

Step1: Determine the electron configuration of copper

Copper has an atomic number of 29. Its electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{10}\). The highest occupied energy level is the fourth energy level (\(n = 4\)).

Step2: Count electrons in the highest energy level

In the fourth energy level (\(4s^{1}\)), the number of electrons is \(1\).

Question 39

Step1: Recall the group - electron relationship

For main - group elements, the group number (for groups 1A - 8A) gives the number of valence electrons (electrons in the highest occupied energy level). Group 5A elements have 5 valence electrons.

Answer:

Question 36: 7
Question 37: 2
Question 38: 1
Question 39: 5