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GenaCL600 [577]
3 years ago
7

Why are chemical changes considered "unseen?"

Chemistry
2 answers:
hichkok12 [17]3 years ago
6 0
<span>Chemical changes are considered unseen because they occur at the atomic level, changing the actual structure of the thing. This is in comparison to a physical change, which is visible.</span>
Andrej [43]3 years ago
5 0
Chemical changes are considered unseen because they occur at the atomic level, changing the actual structure of the thing.
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If an atom has 13 electrons how many electron shells does it have
svlad2 [7]

Answer:

Explanation:

If an atom has 13 electrons then it belongs to p-block of periodic table.

s level can accommodate 2 electrons.

p level can accommodate 6 electrons.

13 means 1s2 2s2 2p6 3s2 3p1.

As you can see there totally 5 sub-shells.

Total number of shells are 3(1,2,3).

4 0
3 years ago
I need the answers of these
Anni [7]

Answer:

Hope this helps :D

Explanation:

Metal: Aluminum and Copper

Non-Metal: Hydrogen and Flourine

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4 0
2 years ago
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3 years ago
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olga55 [171]

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