Electron Structure (OCR A-Level Chemistry A): Quizzes

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Electron structure
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What is the maximum number of electrons that can occupy shell n=3n=3?

18 electrons

What is the shape of a p-orbital?

Dumbbell (figure-of-eight)

How many p-orbitals are there in shell n=3n=3, and how are they oriented?

Three p-orbitals at 90°

From which shell do d-orbitals first begin to appear?

Shell n=3n=3

Which sub-shell fills with electrons first?

4s sub-shell

When filling p-orbitals with 3 electrons, how are they arranged?

1 electron in each of the 3 orbitals

What is the maximum number of electrons that all five d-orbitals can hold together?

10 electrons

What is the electron configuration of oxygen (OO, atomic number 8)?

1s2 2s2 2p41s^2 \, 2s^2 \, 2p^4

When nickel (NiNi) forms Ni2+Ni^{2+}, which electrons are removed first?

Two 4s electrons

Elements in Groups 1 and 2 belong to which block of the periodic table?

s-block

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Shapes of Molecules and Intermolecular Forces

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