A radioactive isotope that decomposes by K-electron capture emission

A radioactive isotope that decomposes by K-electron capture emission

 a.
combines one of its electrons with one of its protons creating an additional neutron.
 b.
gains an electron from its environment.
 c.
gains a helium nucleus.
 d.
gains a particle similar to an electron, but positively charged.
 e.
gains a negatively-charged neutron.


A steel nail or screw may be protected by cathodic inhibition by
   
 a.
coating the steel surface with paint.
 b.
coating the steel surface with grease or oil.
 c.
coating the steel surface with zinc.
 d.
any of the above choices.
 e.
none of the above choices.


Beta emission can best be described as involving
    
 a.
emission from an unstable nucleus of a fragment containing two protons and two neutrons.
 b.
annihilation of a beta particle by a positron.
 c.
capture of an electron by the nucleus, and transformation of a proton into a neutron.
 d.
transformation of a neutron into a electron, and a proton that is ejected from the nucleus.
 e.
transformation of a neutron into a proton, and an electron that is ejected from the nucleus.