Lesson 2.2.1
2.2.1 Electron structure Quiz: OCR Chemistry, Unit 1
20 questions
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Lesson 2.2.1, Electron structure: 20 multiple choice questions for the OCR Chemistry (H432), Unit 1: Foundations in chemistry, written with Revision Ninja.
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The 20 questions
-
What is the maximum number of electrons that can occupy the fourth shell (n = 4)?
- 32
- 50
- 18
- 8
-
How many electrons can one atomic orbital hold?
- 2, with opposite spins
- 10, in a d sub-shell
- 6, one per p orbital
- 1, with parallel spin
-
How many orbitals make up a p sub-shell?
- 5
- 1
- 3
- 6
-
What is the shape of a p orbital?
- spherical
- dumbbell
- planar ring
- cloverleaf
-
Which sub-shell can hold a maximum of 10 electrons?
- f
- s
- p
- d
-
What is the ground-state electron configuration of oxygen (Z = 8)?
- 1s2 2p6
- 1s2 2s2 2p6
- 1s2 2s1 2p5
- 1s2 2s2 2p4
-
What is the ground-state electron configuration of calcium (Z = 20)?
- 1s2 2s2 2p6 3s2 3p6 3d2
- 1s2 2s2 2p6 3s2 3p4 4s2
- 1s2 2s2 2p6 3s2 3p6 4s1 4p1
- 1s2 2s2 2p6 3s2 3p6 4s2
-
What is the ground-state electron configuration of chromium (Z = 24)?
- 1s2 2s2 2p6 3s2 3p6 3d5 4s2
- 1s2 2s2 2p6 3s2 3p6 3d6
- 1s2 2s2 2p6 3s2 3p6 3d4 4s2
- 1s2 2s2 2p6 3s2 3p6 3d5 4s1
-
What is the electron configuration of the sulfide ion, S2- (Z = 16)?
- 1s2 2s2 2p6 3s2 3p2
- 1s2 2s2 2p6 3s2 3p6
- 1s2 2s2 2p6 3s2 3p6 3d2
- 1s2 2s2 2p6 3s2 3p4
-
How many unpaired electrons does a ground-state oxygen atom have?
- 1
- 4
- 0
- 2
-
How many electrons are in the 3d sub-shell of a ground-state zinc atom (Z = 30)?
- 10
- 6
- 12
- 2
-
How many electrons occupy the 4p sub-shell of a ground-state bromine atom (Z = 35)?
- 4
- 6
- 3
- 5
-
Which element has electron configuration 1s2 2s2 2p6 3s1?
- potassium
- aluminium
- sodium
- magnesium
-
Why do electrons occupy separate orbitals in a sub-shell before pairing up?
- Prevent spin flipping
- Maximise nuclear attraction
- Increase atomic mass
- Minimise electron repulsion
-
Which atom has the configuration 1s2 2s2 2p6 3s2 3p5?
- sulfur
- phosphorus
- argon
- chlorine
-
What is the electron configuration of the Mg2+ ion?
- 1s2 2s2 2p6 3s2
- 1s2 2s2 2p5
- 1s2 2s2 2p6 3s1
- 1s2 2s2 2p6
-
Which element has electron configuration [Ar] 3d10 4s2 4p2?
- selenium
- tin
- germanium
- gallium
-
How many electrons are in the 4p sub-shell of the selenide ion, Se2- (Z = 34)?
- 10
- 2
- 6
- 4
-
How many orbitals are in a full third shell (n = 3)?
- 3
- 18
- 6
- 9
-
How many unpaired electrons does a ground-state nitrogen atom have (Z = 7)?
- 5
- 1
- 2
- 3
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