When a beta particle is released from the nucleus of an atom:

a. the number of electrons in the atom decreases by one

b. the number of electrons in the atom increases by one as the beta particle leaves the nucleus and joins the valence electrons

c. the mass number of the atom remains the same

d. the mass number of the atom decreases

c. the mass number of the atom remains the same

Explanation:

General representation of an element is given as: where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

Beta-decay: In this process, a neutron gets converted into a proton and an electron releasing a beta-particle. The beta particle released carries a charge of -1 units.  Thus the number of electrons

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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