Science Brain Teaser

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2
4
7
1
5
3
6
8

横向

1

Nerve cell in the brain

3

Substance with pH below 7

6

Blocking of light by a celestial body

8

Substance with pH above 7

纵向

2

Second lightest element

4

Icy body with a tail near the sun

5

Unit of power

7

Solid with repeating atomic pattern