use the periodic table to determine the electron configuration for ca and pm in noble - gas…
use the periodic table to determine the electron configuration for ca and pm in noble - gas notation\nca:\nar4s²\nar4s¹\nar3s²\nkr4s²
Answer
Explanation:
Step1: Locate Ca on periodic table
Calcium (Ca) has atomic number 20.
Step2: Identify preceding noble - gas
The noble - gas before Ca is argon (Ar) which has atomic number 18.
Step3: Determine remaining electrons
Ca has 20 - 18 = 2 electrons after Ar. These 2 electrons go into the 4s orbital.
Answer:
A. [Ar]4s²