For number one the answer is Iodine because it is in the same group as fluorine. For number two the answer is Germanium for the same reason. For number three the answer is Aluminum for the same reason.
        
             
        
        
        
Answer:
12500(kg*m/s)
Explanation:
F=ma=mv/t=p/t
p=F*t=500N*25 s=12500(kg*m/s)
 
        
             
        
        
        
Thermal- transfer of heat thru space 
Radiation- the average amount of energy of motion in the molecules of a substance 
Thermometer- a thin glass tube with a bulb on one end that contains a liquid, usually mercury or colored alcohol 
Brainly?
        
                    
             
        
        
        
Answer:
Visible Light and Radio waves
Explanation:
The earth's atmosphere is transparent to a few windows in the electromagnetic spectrum. it is completely transparent to allow observation from the ground in visible light rang 380 to 740 nano meters. Also in the range of radio wave as communication are done from space to ground in the form of radio waves.
it is Partially transparent to Microwave and infrared range.