What is at mass no of potassium

If the atomic number of an element is 6 and its mass number is 20, how many neutrons are in the atom's nucleus?

What is a mutual attraction between the nuclei and electrons in two different atoms called? A) a chemical bond B) a compound C) a cation D) a anion

Select the classification for the following reaction. F2 (g) + 2NaCl (s) - -> 2NaF (s) + Cl2 (g)

A sample of 67 G of kno2 is dissolved to make 1 L of solution what is the molarity of the solution? 1.3 m. 0.6 m. 6,773.8m. 329.4m.

A piece of metal weighing 15.442 g is placed in 49.7 ml of ethyl alcohol (d = 798 g/ml) in a graduated cylinder. the alcohol level increases to 51.8 ml. the best value for the density of the metal from these data is:

Foods labeled "fat free" can actually contain less than 0.5 grams of fat.

Plants make their own food. The chemical reaction for this process is shown in the equation below. CO2 + H2O + energy → C6H1206 + O2 What are the products in this chemical reaction? O A. C6H1206 + energy O B. H20 + energy O C. CoH1206+02 O D.

Using ohm's law, explain how voltage changes in relation to current, assuming that resistance remains constant.

An average copper penny minted in the 1960s contained about 3.000 g of copper. how much chalcopyrite had be mined to produce 100 pennies?

Which pack has the greatest change in enthalpy, warm packs (such as hand warmers) or cold packs (such as an ice pack) ?