Factor

N

Na

Ne

P (%)

He

Group I

28

4.067

2.798

82.52%

0.595

Group II

22

3.733

2.940

78.50%

0.566

Group III

29

5.133

4.055

92.96%

0.720

Group IV

11

2.400

2.082

65.78%

0.477