. The shell around the nucleus can be numbered from near to the nucleus as 1, 2, 3, 4, 5. or represented by the letters, K, L, M, N, O,​

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

How have the greenhouse gasses increased from the year 2000 to 2018

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?