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- 1. Multiple Choice
Discover main energy level
Mosely
Ratherford
Boher
- 2. Multiple Choice
....is more chemical active than Na
He
Ca
K
- 3. Multiple Choice
Concentration of....cause blindness
Lead
Calcium
Mercury
- 4. Multiple Choice
.....consist of 3 samilar atoms
Water
Ammonia
Ozone
- 5. Multiple Choice
......is main gas in green house phenomenon
O2
No3
Co2
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