The two electrons that we would lose to form the calcium If we lose two electrons, we have a net deposited two charge. With the atomic number of 20, 20 protons and 20 electrons. For the calcium two plus ion, so if you're thinkingĪbout forming an ion here, we're talking about theĮlectron configurations for a neutral atom meaning equal numbers of To go into the 4s orbital as well and so we pair our spins and we write the electron configuration for calcium as argon in brackets 4s 2. All right, we have one moreĮlectron then potassium and so that electron's going We have increasing energy and that electron goes into a 4s orbital so the complete electron configuration using noble gas notation for potassium is argon in brackets 4s 1. Potassium has one more electron than argon and so we put that extraĮlectron into a 4s orbital because for potassium the 4s orbital is lower energy than the 3d orbitals here. We know argon has 18 electrons and potassium has 19 electrons. Notation to save some time, we work backwards and theįirst noble gas we hit is argon, so we write argon in brackets. Potassium and for calcium but let's do it again really quickly because it's going toĪffect how we think about the d orbitals and so we find potassium which is in the fourth We've already looked at the electron configurations for
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