Which of the following parts of john dalton’s atomic theory, if correct, would have made it impossible for marie curie’s discovery that new elements can be produced when elements are bombarded with neutrons?
all matter is made of atoms.
the atom is the smallest particle of matter.
atoms of the same element are different from atoms of other elements.
chemical change involves the rearrangement of atoms.

Explanation:

The atom is the smallest particle of matter.

As we know atom is not the smallest particle of an element, it is even compose of electron, neutron and proton.

This was not then discovered. Now Marie Curie was a researcher who worked on radioactivity of an element and discovered new elements.

As per theory of radioactivity, It is a property of unstable atomic nuclei. In this process it releases energy in form of radiation.

If Dalton theory that atom is the smallest particle would have been true then definitely it is impossible for Marie Curie to discover new elements as her theories and work were based upon study of different particle of atoms.

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