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).
