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Caesium is a Group(I) metal , like sodium.

It only has one outet most electron , which it readily ionises (loses). To form the ion Cs^+

Caesium has atomic number of '55' in the Periodic Table.

This means that it contains 55 protons, and 55 electrons for the neutrally charged atom.

However, when it ionises it loses one electron , so it now has 54 electrons.

Doin a little sum

55 -54 = (+)1

Hence , because of the '(+)1' is it symbolised as 'Cs^(+)'. Because there is ONE more proton(+) than electrons(-)

NB As an ion it is no longer an ATOM , but an ION.

NNB The name Caesium is pronounced with the 'c' being soft; that is like a letter 's'.

NNNB the 'ae' should be ligated together, not as separate letters.

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lenpollock

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2mo ago
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14y ago

54. metals tend to lose electrons when they become ions to complete their octet valence electrons.

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12y ago

Cesium forms the ion Cs+.

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