横向
1
Smallest unit of an element
4
Naturally occurring inorganic solid
7
Group of similar cells
8
Substance with pH above 7
9
Solid with repeating atomic pattern
纵向
2
Precious yellow metallic element
3
Molten rock beneath Earth surface
5
Center of an atom or cell
6
Compound containing oxygen
10
Force that attracts objects together
11
The Red Planet