Читать книгу Foundations of Chemistry - Philippa B. Cranwell - Страница 88

1 Potassium is an s block element in Group 1 of the periodic table. It is a metal with one outer electron. The electron configuration of potassium is 1s22s22p63s23p64s1. To gain a full outer shell, potassium tends to lose its outer electron and form a K+ ion with electron configuration 1s22s22p63s23p6. This electron configuration is the same as argon, Ar.

2 Chlorine is in Group 7 (Group 17) of the periodic table and has seven outer electrons with electron configuration 1s22s22p63s23p5. It is a non‐metal and tends to gain an electron to form the chloride, Cl−, ion with electron configuration 1s22s22p63s23p6. This electron configuration is the same as argon, Ar.