Saved Bookmarks
| 1. |
Symbols `._(35)^(79)Br` and `.^(79)Br` can be written, whereas symbols `._(79)^(35)Br` and `.^(35)Br` are not acceptable. Answer briefly. |
| Answer» Atomic number of an element is fixed. However, mass number is not fixed as it depends upon the isotope taken. Hence, it is essential to indicate mass number. | |