Electron Arrangement

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There are three types of electrons:-

1) S-electrons (these go round in a spherical shape).

2) P-electrons (these go round in a dumbell-like shape).

3) D-electrons. (treble clef shape).

At A-level, subshell notation is used in electron configuration.

Group 1 and 2 are known as the S-block. They have S-electrons as their outer most shell.

Transitional elements are the D-block. They have D-electrons as their outer shell.

Groups 3-8 are the P-block. They have…


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