Cesium- 137 has a half life of 30 years. If it disintegrates over a period of 90 years, how much (%) remains? How much (%) decayed

Which position represents spring in the southern hemisphere? a) b) c) d)

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Which statement best describes the function of enzymes?