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lorasvet [3.4K]
3 years ago
10

Why is it important foe scientists to know how many valence electrons a given element has

Physics
1 answer:
Vikentia [17]3 years ago
3 0
Because the number of valence electrons of an element determines the properties and in particular the reactivity of that element.

In fact, elements of the first group (i.e. only one valence electron) have high reactivity, because they can easily give away their valence electron to atoms of other elements forming bonds. On the contrary, elements of the 8th group (noble gases) have their outermost shell completely filled with electrons, so they do not have valence electrons, and they have little or no reactivity at all.
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Which geologic feature most likely be represented by contour lines drawn far apart from one another?
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A contour line connects points of the same elevation. Contour lines are usually curves. Closed contours represent hills.

Contour lines can not cross since they represent different elevations. A contour interval is the difference in elevation between one contour and an adjacent contour.

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In the periodic table, the properties repeat in what direction?​
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Left to right and top to bottom

Explanation:

On the periodic table, the properties repeat from left to right and from top to bottom.

Periodic properties have a pattern from the top to the bottom or down a group or family.

Also, across the period from left to right, they also show a repeating pattern.

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  2. Also, some properties decreases from left to right and increases from top to bottom e.g. atomic radius.
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As the contour lines have roughly the same spacing but the actual topography is much steeper, the lines on the mountainous map represent a larger vertical spacing than the lines on the gradual hills.

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