Answer:

Explanation:
Range = Highest value - Lowest value
A 'soft solder' melts between 183 °C and 212 °C.
Melting range of a 'soft solder' = 
A 'hard solder' melts between 620 °C and 680 °C.
Melting range of a 'hard solder' = 
So,
Difference in melting ranges = Melting range of a 'hard solder' - Melting range of a 'soft solder' = 
Scandium (Sc) has the largest atomic mass.
Answer: Sc (Scandium)
The Earth's gravitational force accelerates objects when they fall. It constantly pulls, and the objects constantly speed up.