A fictitious element X is composed of 10.0% of the isotope X-55, 20.0% of the isotope X-56, and 70.0% of X-57. Calculate the average atomic mass of element X

What are transitions between a liquid and a solid called? identify which way they are transitioning

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) in an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? ultraviolet light dim blue light bright red light bright yellow light

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.