For an atom X(Z,A)A is the:

In the argon atom,Ar (Z=18, A=40)the number of neutrons is:

In the calcium atom,Ca(Z=20, A=40) there are

The nuclear charge of the tritium atom,H(Z=1, A=1) is

The three atoms protium, H(Z=1, A=1), deuteriumH(Z=1, A=2) and tritium H(Z=1, A=3)are:

Neutrons are:

The two atomsX(Z=18, A=40) and Y(Z=20, A=40) are:

When an atom loses electrons it forms:

The larger the atomic number (Z) the larger is the:

The charge of an electron cloud is equal to:

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