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abcde956
2 years ago

In particular, the 7th HG e.g. bromine is particularly pleased to receive electrons (halogens) and that of the 1st. HG e.g. H are very good donors, so they like to emit electrons.

tamani44
2 years ago

In the outer shell around the atomic nucleus (after the drill atomic model) the number of valence electrons (=electrons in the outer shell) can always be found exactly as the main group number of the element. Atoms always have the aim of fulfilling the so-called octet state. This means that they aim for a valence shell (outer shell) with exactly 8 valence electrons (8 is the maximum number of electrons that fit into a shell in the main groups).

The elements of the first main group are called alkali metals. As the name says, they have exactly one external electron and they almost want to get rid of it so that they reach a full outer shell with 8 valence electrons.

The elements of the 7th main group are called halogens. They have 7 valence electrons and require only one further electron to fulfill the octet state, i.e. they frequently take up electrons (usually of alkali metals).