A.
| B.
| C.
| D.
|
w |
M |
W |
m+n |
w |
M |
wm |
m+n |
A.13C与15N有相同的中子数 |
B.C60与13C互为同素异形体 |
C.15N与14N互为同位素 |
D.15N的核外电子数与中子数相同 |
20984 |
20984 |
A.质子数是125 | B.中子数是84 |
C.质量数是209 | D.核外电子数125 |
A.x-25 | B.A-x+25 | C.A-x-23 | D.X-23 |
A.
| B.
| ||||
C.
| D.
|
A.78 | B.2 | C.76 | D.0 |
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