Naturally occurring europium (Eu) consists of two isotopes: 151Eu has a mass of 150.973 amu and an abundance of 48.03%; 153 Eu has a mass of 152.951 amu. What is the atomic
mass of europium?

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

Aconcentrated solution of ammonia is 14.8m and has a density of 0.899g/l. what is the concentration of ammonia in this solution in weight percent (%w/w)?

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro