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ivann1987 [24]
3 years ago
12

30 POINTS TO WHOEVER CAN FIGURE IT OUT!!When is the sun directly overhead at the equator?

Chemistry
2 answers:
tresset_1 [31]3 years ago
8 0

Answer:

D

Explanation:

The sun is directly overhead at the equator during the vernal (usually March 20) and autumnal (around September 23) equinoxes.

Basically, what happens is that on these two days, day and night practically last for an equal number of hours.

Hope this helps!

Andre45 [30]3 years ago
3 0

Answer:

D) Vernal and autumnal equinoxes.

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Why are the alkali metals and the halogens very reactive
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Answer in explanation

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The reactivity or passiveness of an element depends solely on how close it is to attain a noble gas configuration. This means the closer an element is to attain a noble gas configuration, the greater its reactivity in both direction, positively or negatively.

Alkali metals belong to group 1 of the periodic table while halogens belong to group 17 of the periodic table. This means they are just one electron away from achieving the stability of a noble gas configuration. While alkali metals need to lose one electron to form a univalent positive ion, halogens news to gain one electron to form a univalent negative ion.

They tend to go about this vigorously and as such undergo several chemical reactions because of that single electron they neeed.

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HOPE IT HELPS :)

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