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Atomic Structure and Periodic Table

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Across
1
Bonding rule
4
Nuclear glue
5
Nitrogen hydride
7
Group 7A
8
Element P
10
Betwixt and between
13
Atom with an attitude
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Iron is one
18
A diatomic gas
20
Alchemist's dream
Down
2
Red mercury
3
Outer for electrons
6
Radiation form
9
The green lion, to an alchemist
11
Wolfium
12
Developed the first modern atomic theory
15
Argon etc.
16
Same, but different
17
Atom's heavy part
19
Bonds for oxygen