What is the electron configuration for helium (He)?
1s1
1s2
1s22s1
1s22s2

Which statement best describes the function of enzymes?

How can a give a full method for the experiment of separating sand from water by filtration? 1-materials 2-steps 3-conclusion also for water and salt separated by the evaporation or distillation process

What is happening when the water inside a kettle heats up and begins to boil