ONE-EIGHTH STAGE 2026
Contest 10
Labone SHS: 44 points
St. Francis Xavier Jnr. Sem.: 28 points
Koforidua Sec. Tech. Sch.: 20 points
Contest 11
St. Hubert Sem. SHS: 48 points
Mawuli School: 44 points
Konongo Odumase SHS: 19 points
Contest 12
Tamale SHS: 56 points
St. Thomas Aquinas SHS: 35 points
Edinaman SHS: 29 points
ROUND 2 - SPEED RACE
QUESTION
What is the maximum number of electrons in an atom that can have the quantum numbers $n=4$ and $l=1$?
ANSWER: 6 electrons
SOLUTION:
$n=4$, $l=1$ specifies the entire $4p$ subshell (all its orbitals), not one single orbital.
A subshell holds $2(2l+1)$ electrons:
$2(2\times1+1) = 2\times3$
$2(2\times1+1) = 6$
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PRACTICE QUESTIONS
1. QUESTION: What is the maximum number of electrons in an atom that can have the quantum numbers $n=3$ and $l=2$?
ANSWER: 10 electrons or $1\times10^{1}$ electrons
SOLUTION:
A subshell holds $2(2l+1)$ electrons.
$\text{electrons} = 2(2\times2+1)$
$\text{electrons} = 10$
2. QUESTION: What is the maximum number of electrons in an atom that can have the quantum numbers $n=2$ and $l=1$?
ANSWER: 6 electrons
SOLUTION:
A subshell holds $2(2l+1)$ electrons.
$\text{electrons} = 2(2\times1+1)$
$\text{electrons} = 6$
3. QUESTION: What is the maximum number of electrons in an atom that can have the quantum numbers $n=4$ and $l=3$?
ANSWER: 14 electrons or $1.4\times10^{1}$ electrons
SOLUTION:
A subshell holds $2(2l+1)$ electrons.
$\text{electrons} = 2(2\times3+1)$
$\text{electrons} = 14$
4. QUESTION: What is the maximum number of electrons in an atom that can have the quantum numbers $n=3$ and $l=1$?
ANSWER: 6 electrons
SOLUTION:
A subshell holds $2(2l+1)$ electrons.
$\text{electrons} = 2(2\times1+1)$
$\text{electrons} = 6$
5. QUESTION: What is the maximum number of electrons in an atom that can have the quantum numbers $n=5$ and $l=2$?
ANSWER: 10 electrons or $1\times10^{1}$ electrons
SOLUTION:
A subshell holds $2(2l+1)$ electrons.
$\text{electrons} = 2(2\times2+1)$
$\text{electrons} = 10$
6. QUESTION: What is the maximum number of electrons in an atom that can have the quantum numbers $n=3$ and $l=0$?
ANSWER: 2 electrons
SOLUTION:
A subshell holds $2(2l+1)$ electrons.
$\text{electrons} = 2(2\times0+1)$
$\text{electrons} = 2$