What is the concentration of a stock solution if 20 mL was used to make 400 mL of a 1.44 M solution? Group of answer choices

40 M

50 M

30 M

5 M

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

did anyone actually do this? like if anyone has submitted this i rly need .