What does the sum of the protons and neutrons in an atom equal

CN - is a Bronsted - Lowry base. What will this substance form when it accepts a proton?

Is mixing food coloring with water a chemical or physical change?

What is the charge on an atom after it loses an electron during the formation of a bond?

Calculate the [H^+], Identify the solution as acidic, basic or neutral. pH=2.5

How do the masses of protons and neutrons compare?

if you pull a Tomac radius versus First ionisation Energy would the graph reveal a direct or inverse relationship

Which of the following bonds is the most polar in nature: (1) Cl2 (2) HCl (3) HBr (4) HI

Combustion analysis of a 13.42-g sample of the unknown organic compound (which contains only carbon, hydrogen, and oxygen) produced 36.86g CO2 and 10.06g H2O. The molar mass of estriol is 288.38g/mol.

What concept in Dalton's atomic theory has been modified? A. All matter is composed of atoms. B. Atoms of different elements have different properties and masses. C. Atoms can combine in chemical reactions. D. Atoms cannot be divided.

Which particles in an atom can increase or decrease in number without changing the identify of the elements?