the element D with proton number 37 forms a singly charged positive ion in its salt .
The number of protons in an atom's nucleus is known as the proton number. The number of protons determines an element's identity (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
Atoms or molecules that have an inelastic collision with an energetic electron and lose an electron as a result give rise to positive ions (electron impact ionization).
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