What is the rounded atomic mass for helium?

SI unit of binding energy? What is a reaction where two different compounds exchange positive ions and form two new compounds? Why do you weigh more on the Earth than you would on Pluto? What is the most common source of water? What is true of a convalet bond? What happen to the size of the field of view of a microscope when you switch from low power to high power why? What is a metaphor for rough endoplasmic reticulum? How big is San Francisco? How is the cotoneaster seed dispersed? How do I know what size hinge I have? In cells of multicellular organisms the cell membrane contains molecules involved in cell communication what specific term is used to identify these molecules? How do you find force while given kinetic energy and distance? How many cubic centimeters are in one cubic centimeter? What does the third quantum number i describe? Which human body system is linked to asthma? What does the term 'tribecca' mean? When a chemical reaction takes place in an open system? What is better gfi outlet or surge protector? If you place opposite poles of two magnets facing each other what will happen? What is a sign that the weather is turning for the worse?