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how do i determine the valence shells of an atom.?

example pls...

1. Cesium
2. Bromine

2007-01-28 01:36:06 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry

1 answers

Look at their position on the periodic table. Cs is in group 1A so it has 1 valence e-. Br is in group 7A so it has 7 valence e-.

2007-01-28 02:07:14 · answer #1 · answered by physandchemteach 7 · 0⤊ 0⤋

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