How many neutrons are in the radioactive isotope?

40

19

21

20

Under what conditions does an ionic compound precipitate from a solution of the constituent ions?

What is necessary in order for clouds to form when the atmosphere is absolutely stable? cooling of the air mass from below a lifting mechanism other than convection (such as a front) an environmental lapse rate less than 5°C a high degree of

A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. The lightbulb is turned on for 0.020 h, and the assembly expands from an initial volume of 0.90 L to a final volume of 5.88 L against an external pressure of 1.0 atm.

A solution is an acid or base and it doesn't react with metal. is it pH more likely to be 4 or 9? explain your answer

People exert a downward force (their weight) when sitting in a chair. Why do people not fall through chairs due to this force?

The type of nuclear decay an unstable nucleus will undergo depends on its ratio of neutrons to protons. The radioisotope cobalt-65 has a ratio of neutrons to protons of 1.41, which is too high for a nucleus of this size.

1.87 $/gal to dollars per liter, Express your answer using three significant figures.

What can a student do to increase the force of attraction of a magnet on an iron block?

Which elements can react to produce a molecular compound?

Who created the periodic table and in what year?