Chemistry

Level 1

1

Name the three subatomic particles found in an atom.

Protons, neutrons, and electrons.
(Oopsie! Your team loses 1 point. Blame the universe.)

2

An atom has an atomic number of 23. What is this atom?

The atom is vanadium (V)
(Robbery! Steal 1 point from any team. They will remember this.)

3

What is the name of the dense centre of an atom?

The nucleus.
(Sweet! Your team gets +1 point. Act humble.)

4

What is a nucleon?

A nucleon is a general term for protons and neutrons found inside the nucleus.
(Your team gets +1 point)

5

An atom has 45 protons. What is this atom?

The atom is rhodium (Rh)
(Your team gets +1 point. Small win, big energy.)

Level 2

1

What is the name for a positively charged ion?

A positively charged ion is called a cation.
(Double Trouble: +2 if you're right, -2 if you're wrong. No pressure.)

2

Where do protons, neutrons and electrons located?

Protons and neutrons are located in the nucleus and electrons are located in electron shells.

(Nice one! Your team gets +2 points. Bask in the glory.)

3

Give an equation to calculate the charge on an ion.

Charge on an ion = number of protons – number of electrons.
(Lucky Duck! Your team gets +2 points. Quack quack.)

4

Define isotopes.

Isotopes are atoms that have the same number of protons but different numbers of neutrons
(Pick a team. They lose 2 points. )

5

How do you calculate the mass number of an atom?

Mass number (A) = number of protons + number of neutrons.
(Your team loses 1 point. It's not a big deal.)

Level 3

1

An atom, X has 16 protons and 18 neutrons. Calculate its nucleon number.

Nucleon number = protons + neutrons = 16 + 18 = 34.
(Choose a team. They lose 2 points. Say "sorry" with a smile. ) 

2

A neutral atom of chlorine has 17 protons and 18 neutrons. Calculate the number of electrons in this atom.

In a neutral atom, electrons = protons = 17. 

(Random Luck! Your team gets +2 points AND Choose another question.)

3

An atom of element Y has a mass number of 52 and an atomic number of 24. Calculate the number of neutrons in this atom.

Neutrons = mass number – atomic number = 52 – 24 =28

(Nice one! Your team gets +3 points. Bask in the glory.)

4

True or False: An atom of ³⁵₁₇Cl has 17 protons, 18 neutrons, and 17 electrons.

True. Protons = 17, neutrons = 35 – 17 = 18, electrons = 17 (neutral atom). 

(ne for Me, Two for You: Your team -1, pick a team to lose 2.  )

5

True or False: An atom of ⁵⁶₂₆Fe has 26 protons，30 electrons and 30 neutrons.

False. A neutral iron atom has 26 electrons, not 30.
(Point Donation: Give 2 points to any team. Yes, you lose them. Be a hero)

Level 4

1

 The ion ²⁴₁₂Mg²⁺ has how many electrons?

Mg atom has 12 electrons. It loses 2 electrons to form Mg²⁺, so electrons = 12 – 2 = 10 

(Double Trouble: +4 if correct, -4 if wrong. Drama included.)

2

The ion ²⁷₁₃Al³+ has how many electrons?

Al atom has 13 electrons. It loses 3 electrons to form Al³⁺, so electrons = 13 – 3 = 10.

(Lucky Star! Your team gets +4 points.  ) 

3

An ion X³⁻ has 18 electrons. Identify(识别) this ion.

P³⁻, charge = protons – electrons 3- = protons - 18

protons = 15.

(Chill Round: Choose a team. Next round, everything is 50%. Less pain, less gain.)

4

An ion has 18 electrons and a charge of –2. What is the atomic number of the element?

Atomic number = number of protons = 16. 

（Lucky Star! Your team gets +4 points.）

5

An ion has 17 protons and 18 electrons. Is this ion a cation or an anion?

It is an anion , because electrons > protons.
(Another team loses 2 points. You didn't do it. Wink wink.） 

Level 5

1

In which species are the numbers of protons, neutrons and electrons all different?
A  ²⁷₁₃Al
B  ³⁵₁₇Cl⁻
C  ³²₁₆S²⁻
D  ³⁹₁₉K⁺

Answer: D (Big Win! Your team gets +5 points. )

A: p⁺ = 13, n⁰ = 14, e^-= 13 

B: p⁺ = 17, n⁰ = 18, e^- = 18 

C: p⁺ = 16, n⁰ = 16, e^- = 18 

D: p⁺ = 19, n⁰ = 20, e^- = 18 

2

In which pair do the atoms contain the same number of neutrons?

A  ¹¹₅B and ¹²₆C
B  ⁷₅Li and ⁹₄Be
C  ²⁴₁₂Mg and ²⁸₁₄Si
D  ¹⁴₇N and ¹⁶₈O

A ( Swap scores with any team. Absolute madness.)

A: ¹¹B has 6 neutrons; ¹²C has 6 neutrons

B: ⁷Li has 4 neutrons; ⁹Be has 5 neutrons 

C: ²⁴Mg has 12 neutrons; ²⁸Si has 14 neutrons 

D: ¹⁴N has 7 neutrons; ¹⁶O has 8 neutrons 

3

Which pairs of species have the same number of electrons?

1. ³⁵₁₇Cl and ³⁷₁₇Cl 

2. ³⁵₁₇Cl- and ⁴⁰₁₈Ar 

3.⁴⁰₁₈Ar and ⁴⁰₁₉K⁺

A. 1 and 2   B. 1 and 3   C. 2 and 3    D. 1, 2 and 3

Answer: D (+4 if correct, -4 if wrong. You may ask another team for help, but they get +1 if you're right.)
both Cl atoms have 17 e-.
Cl- has 18 e-, Ar has 18 e-.
Ar has 18 e-, K+ has 18 e-.

4

Which species has 28 electrons?

A  ²⁸₁₄Si
B  ⁵⁶₂₆Fe²⁺
C  ⁵⁹₂₇Co²⁺
D  ⁶⁴₂₉Cu⁺

Answer: D (Chaos Button: Next round, every + and - is ×2. Enjoy the ride.)

A: Si atom: protons = 14, electrons = 14

B: Fe²⁺: protons = 26, electrons = 26 – 2 = 24

C: Co²⁺: protons = 27, electrons = 27 – 2 = 25 

D: Cu⁺: protons = 29, electrons = 29 – 1 = 28 

5

Atom X has 12 neutrons and 12 protons.
Which atom is an isotope of X?
A  ²⁴₁₂X
B  ²⁵₁₂X
C  ²⁴₁₃X
D  ²⁵₁₃X

Answer: B 

(Be generous! +5 points, and choose another team +6. Or get nothing. )