Can someone please explain what this means?

2017-09-12 12:01 pm

Got this from my textbook:

We can connect the number of valence electrons with the chemical properties of elements in a family. As we move across a period from left to right, we observe trends in reactivity. Specifically, we see that elements in Group 1 are highly reactive, then reactivity decreases as we move to the right. (This I can understand fairly well)

Reactivity starts to increase again after Group 14, rising as we reach the halogens and then dropping rapidly at the noble gases. (This I dont understand at all)

回答 (1)

micatkie

2017-09-12 1:07 pm

✔ 最佳答案

"Specifically, we see that elements in Group 1 are highly reactive, then reactivity decreases as we move to the right."
Group 1 elements are reactive metal. As we move to the right, the REACTIVITY OF METAL decreases.

"Reactivity starts to increase again after Group 14, rising as we reach the halogens ….."
For elements from Group 14 to Group 17 (halogens), the REACTIVITY OF NON-METAL increases.

"…… and then dropping rapidly at the noble gases. (This I dont understand at all)"
The reactivity of noble gases is extremely low.

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