Which of these elements have the smallest 1st ionization energy

Ionization energy increases as you go across a period, and increases as you move up a group. So, elements with the smallest ionization energy would be at the bottom left corner of the periodic table. Examples of elements with small ionization energy: Francium (Fr), Cesium (Cs), Radium (Ra).

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.