Uranium-235 has a half-life of 7.04 x 108 years. How many years will it take for 99.9% of a U-235 sample to decay

What is the chemical name of the compound na2co3? use the list of polyatomic ions and the periodic table to you answer. a. sodium carbon oxide b. sodium carbonate c. sodium(ll) carbonate d. sodium oxalate

What does an electron configuration for an atom relate to the atoms placement on the periodic table

Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. anouther scientist conducted the same experiment and got similar results. which concept does this best illustrate? a) repetition b) replication c) precision d) validity