Which two elements have the most similar chemical properties? A)Cl and Ar
B)Be and Mg
C)Na and P
D)Ca and Br

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

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

How do limiting factors most affect population size? ostop population growthrestrict population growthincrease population sizeresult in positive impactso