Since it has 4 protons, it must have an atomic number of 4. (That makes it beryllium.)
Since it has a 4 protons and 5 neutrons, it has a mass number of 9.
Measurement is defined as the act of measuring or the size of something. An example of measurement means the use of a ruler to determine the length of a piece of paper. An example of measurement is 15" by 25".
Yes - diffusion is a broad term that may be applied to a vast number of substances and is not limited to liquids ( gases can diffuse too). osmosis refers to the diffusion of liquid water down the water potential gradient
