A neutral atom possesses an atomic number of 15 and an atomic mass of 31. Three electrons are gained.
a negatively charged ion
a new isotope of the element
a positively charged ion
a new isomer of the element
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Answer:
a negatively charged ion
Explanation:
see,
an isotope means same atom with different mass no. and mass only differ when there is addition of neutrons (you might study in fusion)
if it is gaining electron then definitely it's not a positive ion
and about isomers I am not too sure, It not an isomer because isometric compounds have same empirical formula so gaining of electrons don'ts cause it. mark branliest
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