Find the number of inner transition element among those having following atomic numbers: 29,59,74,95, 102, 104,89,57,72.

The element having atomic number 59, 95, 102 are inner transition elements.

Between the elements actinium (Z=89) and rutherfordium (Z=104), and between lanthanum (Z=57) and hafnium (Z=72), are the inner transition elements. The lanthanides and actinides are the elements that follow lanthanum, respectively, and follow actinium, respectively.

Hence, the number of inner transition element among those having following atomic numbers are 3.