How many shells are occupied in atoms of elements in period 4?

Explanation:

Since, Number of shells in an atom = number of period

Therefore, atoms of element will have 4 shells.

For example:

K (Potassium) is an element of 4th period whose atomic number is 19.

19 = 2, 8, 8, 1

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".