Here are the electron configurations for the given atomic numbers: A) Atomic number = 13 Step 1: The atomic number is 13, so there are 13 electrons. Step 2: Fill the orbitals in order: $1s$, $2s$, $2p$, $3s$, $3p$. $$1s^2 2s^2 2p^6 3s^2 3p^1$$ $$\boxed{\text{}1s^2 2s^2 2p^6 3s^2 3p^1\text{}}$$ B) Atomic number = 20 Step 1: The atomic number is 20, so there are 20 electrons. Step 2: Fill the orbitals in order: $1s$, $2s$, $2p$, $3s$, $3p$, $4s$. $$1s^2 2s^2 2p^6 3s^2 3p^6 4s^2$$ $$\boxed{\text{}1s^2 2s^2 2p^6 3s^2 3p^6 4s^2\text{}}$$ C) Atomic number = 19 Step 1: The atomic number is 19, so there are 19 electrons. Step 2: Fill the orbitals in order: $1s$, $2s$, $2p$, $3s$, $3p$, $4s$. $$1s^2 2s^2 2p^6 3s^2 3p^6 4s^1$$ $$\boxed{\text{}1s^2 2s^2 2p^6 3s^2 3p^6 4s^1\text{}}$$ D) Atomic number = 1 Step 1: The atomic number is 1, so there is 1 electron. Step 2: Fill the $1s$ orbital. $$1s^1$$ $$\boxed{\text{}1s^1\text{}}$$ E) Atomic number = 7 Step 1: The atomic number is 7, so there are 7 electrons. Step 2: Fill the orbitals in order: $1s$, $2s$, $2p$. $$1s^2 2s^2 2p^3$$ $$\boxed{\text{}1s^2 2s^2 2p^3\text{}}$$ F) Atomic number = (unclear) The atomic number for element F is unclear in the image (both "10" and "7" are crossed out). Therefore, the electron configuration cannot be determined. G) Atomic number = 10 Step 1: The atomic number is 10, so there are 10 electrons. Step 2: Fill the orbitals in order: $1s$, $2s$, $2p$. $$1s^2 2s^2 2p^6$$ $$\boxed{\text{}1s^2 2s^2 2p^6\text{}}$$ H) Atomic number = (missing) The atomic number for element H is missing in the image. Therefore, the electron configuration cannot be determined. I) Atomic number = (missing) The atomic number for element I is missing in the image. Therefore, the electron configuration cannot be determined. J) Atomic number = 5 Step 1: The atomic number is 5, so there are 5 electrons. Step 2: Fill the orbitals in order: $1s$, $2s$, $2p$. $$1s^2 2s^2 2p^1$$ $$\boxed{\text{}1s^2 2s^2 2p^1\text{}}$$ K) Atomic number = 17 Step 1: The atomic number is 17, so there are 17 electrons. Step 2: Fill the orbitals in order: $1s$, $2s$, $2p$, $3s$, $3p$. $$1s^2 2s^2 2p^6 3s^2 3p^5$$ $$\boxed{\text{}1s^2 2s^2 2p^6 3s^2 3p^5\text{}}$$ 3 done, 2 left today. You're making progress.