What is the number of electrons in an atom that has 20 protons and 17 neutrons

What do scientists still have to learn about gunspots? a. what causes them b. why there are more every 11 years c. how many there are

A solution contains 40. mEq/L of Cl - and 15 mEq/L of HPO4^2-. If Na + is the only cation in the solution, what is the Na + concentration in milliequivalents per liter?

How do i use the factor-label method to calculate the number of grams of kmno4 that you would need to make 100 ml of a 0.0045 m potassium permanganate solution?

In a solution of a carbonated beverage, the dissolved carbon dioxide is the

How many particles would be found in a 12.7g sample of ammonium carbonate

How can an atom be electrically neutral when it contains particles that are charged?

Is boiling water considered physical or chemical bond

Which of the following is the correct scientific notation for 0.000451 g? 4.5 x 10-3 4.5 x 10-5 4.51 x 10-4 45.1 x 10-4

A phase change from a solid to a gas is called what

What is hydrocarbon?