Electronic Structure Flashcards

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Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

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What do electrons occupy in an atom?

Energy levels called shells around the nucleus.

Which shells fill first when adding electrons?

The lowest energy levels fill first, starting with the shell closest to the nucleus.

How many electrons can the first, second and third shells hold?

First holds up to 2; second up to 8; third up to 8.

What is electron configuration?

The number of electrons in each shell of an atom.

In a neutral atom, how do you find the number of electrons?

It equals the atomic number.

How do you write an electron configuration from the atomic number?

Use the atomic number, then fill shells: 2 in the first, 8 in the second, then 8 in the third, until you use all electrons.

What does the group number (for Groups 1 to 7) tell you?

It equals the number of electrons in the outer shell.

What does Group 0 tell you about electron structure?

Atoms have a full outer shell.

What does the period number tell you about an atom?

How many electron shells are occupied.

Which electrons take part in chemical reactions?

Outer shell (valence) electrons.

What is the electron configuration of sodium (atomic number 11)?

2,8,1.

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

2,6.

Revision Notes
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