If the unstable atoms in a rock have a half - life of 2 millions years and the rock begins with the 8 mg of unstable atoms, how many milligrams of unstable atoms will be found in the rock 4 million years after its formation? A. 8 mg
B. 4 mg
C. 2 mg
D. 1 mg​

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation:

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added