رد: كيمياء 110 بحلتها الجديد ((شرح المحاضرات))
نحل بعض الاسئلة ...
The rows of the periodic table are called:
classes
periods
groups
families
Which element is an example of a noble gas?
Krypton
Chlorine
Iridium
Nitrogen
All of the following are alkali ls, except which element?
Sodium
Rubidium
Cesium
Radium
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