↑ ในระบบตั้งชื่อหมู่ของไอยูแพกเก่านั้น มันถูกตั้งชื่อว่า หมู่ IA (อ่านว่า "หมู่หนึ่งเอ" โดย "I" เป็นระบบเลขโรมัน)[11]
↑ The number given in parentheses refers to the measurement uncertainty. This uncertainty applies to the least significant figure(s) of the number prior to the parenthesized value (ie. counting from rightmost digit to left). For instance, 1.00794(7) stands for 1.00794±0.00007, while 1.00794(72) stands for 1.00794±0.00072.[34]
↑ The value listed is the conventional value suitable for trade and commerce; the actual value may range from 6.938 to 6.997 depending on the isotopic composition of the sample.[36]
↑ The element does not have any stable nuclides, and a value in brackets indicates the mass number of the longest-lived isotope of the element.[35][36]
↑ The quoted values are for the tetracoordinate ions, except for Rb+ and Cs+ where they are for the hexacoordinate ion.
