Àwọn mẹ́tàlì álkálì ni egbe kan lori tabili idasiko awon elimenti to ni awon elimenti lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), ati francium (Fr) ninu. Egbe yi wa ni inu s-block lori tabili idasiko nitoripe gbogbo awon metali alkali ni elektronu ode won ni inu s-orbital. Awon metali alkali ni apere ijora egbe bi awon ini lori tabili idasiko, pelu awon elimenti inu ti won unwuwa isejora. Caesium is the spelling recommended by the International Union of Pure and Applied Chemistry (IUPAC). The American Chemical Society (ACS) has used the spelling cesium since 1921, following Webster’s Third New International Dictionary. Àdàkọ:RedBook2005. Coghill, Anne M.; Garson, Lorrin R., eds (2006). The ACS Style Guide: Effective Communication of Scientific Information (3rd ed.). Washington, D.C.: American Chemical Society. p. 127. ISBN 0-8412-3999-1. . Coplen, T. B.; Peiser, H. S. (1998).