An atom X has 2,8,5 electronic configuration. what is it's valence electrons and valency

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %

At element makes up all organic compounds?

Which of the following warnings would an agricultural chemist tell a farmer who wants to recycle his or her own ammonia? recycling ammonia is a difficult process that sometimes takes weeks. recycling ammonia requires a degree in biochemistry or a related field. recycling ammonia can be harmful because it is highly flammable and toxic. recycling ammonia costs too much money considering the price of the necessary chemicals.