Question: Which of the following elements has the electronic configuration [Kr] 5s2?
Options:
Sr
Y
Zr
Nb
Correct Answer: Sr
Solution:
Strontium (Sr) has 38 electrons, and its electronic configuration is [Kr] 5s2.
Which of the following elements has the electronic configuration [Kr] 5s2?
Practice Questions
Q1
Which of the following elements has the electronic configuration [Kr] 5s2?
Sr
Y
Zr
Nb
Questions & Step-by-Step Solutions
Which of the following elements has the electronic configuration [Kr] 5s2?
Step 1: Understand that the electronic configuration [Kr] 5s2 means that the element has the same electron configuration as Krypton (Kr) plus 2 electrons in the 5s orbital.
Step 2: Know that Krypton (Kr) has 36 electrons.
Step 3: Add the 2 electrons from the 5s orbital to the 36 electrons of Krypton, which gives you 36 + 2 = 38 electrons.
Step 4: Identify the element with 38 electrons on the periodic table, which is Strontium (Sr).
Step 5: Conclude that the element with the electronic configuration [Kr] 5s2 is Strontium (Sr).
No concepts available.
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