Easy
The atomic number of an element is $35$ and its mass number is $81$. The number of electrons in the outermost shell is:
- A$7$
- B$6$
- C$5$
- D$3$
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Similar Questions
Which of the following sets of quantum numbers is not possible for an electron?
The allowed set of quantum numbers for an electron in a hydrogen atom is
MediumKVPY 2017
View SolutionConsider the following sets of quantum numbers $(n, l, m_l)$:
Set $(n, l, m_l)$ $A$ $(3, 3, -3)$ $B$ $(3, 2, -2)$ $C$ $(2, 1, +1)$ $D$ $(2, 2, +2)$
The number of correct sets of quantum numbers is $....$.
| Set | $(n, l, m_l)$ |
|---|---|
| $A$ | $(3, 3, -3)$ |
| $B$ | $(3, 2, -2)$ |
| $C$ | $(2, 1, +1)$ |
| $D$ | $(2, 2, +2)$ |
The number of correct sets of quantum numbers is $....$.
How many electrons in an atom can have the quantum numbers $n = 3, l = 2, m = +2, s = +1/2$?
Medium
View SolutionFor which of the following sets of four quantum numbers,an electron will have the highest energy?
$n$ $l$ $m$ $s$
$n$ $l$ $m$ $s$
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