Saved Bookmarks
| 1. |
The atomic numbers of three elements A, B and C are given below :ElementAtomic numberA5B7C10(i) Which element belongs to group 18 ? (ii) Which element belongs to group 15 ?(iii) Which element belongs to group 13 ? (iv) To which period/periods do these elements belong ? |
|
Answer» (i) C (2, 8). (ii) B (2, 5). (iii) A (2, 3). (iv) 2nd period (2 shells are filled). |
|