The sum of the protons and neutrons in an atom equals the?

Almost all of the oxygen on the planet Earth is found in the atmosphere. Is this true or false?

Strontium has the atomic number of 38 and a mass number of 88 how many neutrons are in one atom of strontium A.) 50 B.) 38 C.) 88 D.) 126

A liquid has a mass of 54.5g and a volume of 50.0 mL. calculate the specific gravity. How would I work this out

Balance Decomposition NH3 =

Juan made the following bar graph shown to represent the relative distances of four different astronomical bodies from Earth. The title of the bar graph is Distance of Bodies in Space from Earth. Four bars are labeled A, B, C, and D.

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) How many moles of lithium are needed to produce 0.60 mol of Li3N when the reaction is carried out in the presence of excess nitrogen?

7. Convert 5.2 cm of magnesium (Mg) ribbon to mm of Mg ribbon.

If you place a crystal substance on a tabletop, return to view it after some time passes, and find it as a powdered substance, which of the following processes most likely took effect? A. Efflorescence B. Distillation

What changes occur in the nuclei of atoms involved in the reactions that fuel nuclear power plants?

Calculate the molar mass for HCN. 0.2703 g/mol 2.703 g/mol 27.03 g/mol 270.3 g/mol