An element is defined by its:

The main subatomic particles are:

The charge of the nucleus is:

The number of neutrons N can be determined by:

The neutral particles are called:

The mass of the atom is concentrated in:

The atom is electrically neutral since:

Isotopes are:

Cl (Z=17, A=35) and Cl (Z=17, A=37) are:

The number of elements in this set V(Z=7, A=14)- W(Z=12,A=25)-X(Z=6,A=12)-Y(Z=7,A=13) and Z(Z=6,A=13) is:

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