MCQ
The elements with atomic number $117$ and $120$ are yet to be discovered. In which group would you place these elements when discovered ?
- ✓$17 , 2$
- B$16 , 4$
- C$15 , 3$
- D$18 , 2$
✓
Answer
Correct option: A.
$17 , 2$
a
Atomic number $Z=117$
Atomic number $Z=117$
Number of protone $=117$ Electronic configuration is $[R n] s f^{4} 6 d^{10} 7 s^{2} 7 p^{5}$
Belong to group 17 - halogen family Atomic number $=z=120$
Electronic configuration is [440] $8 s^{2}$ element belong to group 2 - alkali earth family
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