It is situated in period number 1.
Potassium undergoes beta (minus) decay to produce an electron and a calcium nucleus.
8.33 m/s
Explain:
If you understand what 1 km = 1000 m and 1 hr = 60*60 seconds signify, you already know what they mean. If you translate 1000 m/ 3600 s to km/hr, you'll get 5 m/ 18 s, which you can multiply by 30 to get (30 x 5)/18 = 8.33 m/s.
Weight is the force of gravity and gravity changes due to location like on the moon there is a different force of gravity
