Which of the following cannot be determined by analyzing the periodic table? a) the number of protons b) the chemical symbol for each element c) the year the element was discovered d) the number of electron energy levels

Option (c) is the correct answer.

Explanation:

Periodic table is basically a chart which depicts symbol of all the elements found in nature. And, these elements are represented along with their atomic number, and mass number.

Also, elements present in their respective period will tend to have same number of shells.

For example, potassium and scandium are both period 4 elements and they have four energy shells.

Thus, we can conclude that the year the element was discovered cannot be determined by analyzing the periodic table.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

it would be c. predictability