How do the chemical characteristics of the elements in a period change from left to right across the periodic?

table?

Answer:
From left to right, the only generalizations are increasing electronegativity and valence shell filling. With the inert gases, you can't say, however, that they are more electronegative, since they have the neutral full valence shell.

BTW: coool name there, lithiumdeuteride. I suppose that would be lithium-6 deuteride!
In general, the elements on the left side tend to form positive ions, while the elements on the right side tend to form negative ions. That is quite an oversimplification, though.

The real story has to do with valence shell structure, electronegativity, and atomic size, but it gets quite complicated.

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