Which one of the following processes results in a decrease in the number of neutrons? corrosion electron capture gamma emission positron emission alpha emission

alpha emission.

Explanation:

in an alpha decay or alpha emission, alpha particle is a helium nucleus with two protons and two neutrons. This process results in the decrease in the proton number by two and neutron number by two.

gamma emission descent affect the amount of protons and neutrons.

Also, electron capture will not affect the number of neutrons, but increases the proton number by 1