Answer:
Electromagnetic Waves
Explanation:
Electromagnetic waves do not need a medium to travel through, so therefore, they are faster.
Answer:
Periods have consecutive atomic number as they are in a row and groups are vertical meaning they are in a column and groups have similar properties
Since its volume you do what it says 55 cm x 100 cm x 80cm and do 100 x 50 which is 5,000. then 5,000 x 80 which is 40,000. sorry i cant show work on here.
