What is the electronic configuration of the element with atomic number 15?

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Q: What is the electronic configuration of the element with atomic number 15?

Solution: The element with atomic number 15 is phosphorus (P), and its electronic configuration is [Ne] 3s2 3p3.

Steps: 7

Step 1: Identify the atomic number. The atomic number 15 corresponds to the number of protons in an atom.
Step 2: Find the element with atomic number 15. This element is phosphorus (P).
Step 3: Determine the electron configuration. Electrons fill energy levels around the nucleus in a specific order.
Step 4: Use the noble gas notation. The nearest noble gas before phosphorus is neon (Ne), which has an atomic number of 10.
Step 5: Count the remaining electrons. Phosphorus has 15 electrons, so after neon (10 electrons), there are 5 electrons left to place.
Step 6: Fill the 3s subshell with 2 electrons and the 3p subshell with 3 electrons. This gives us 3s2 3p3.
Step 7: Combine the noble gas notation with the remaining configuration. The final electronic configuration is [Ne] 3s2 3p3.