Which of the following elements has four shells? K - magnesium

Li - Lithium

P - Phosphor

F - Fluorine

He - Helium

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous