Calcium and water form calcium hydroxide and hydrogen gas also called what type of reaction

In which of these cases are the two wave points considered to be in phase with each other?

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive

What was bohr’s contribution to the planetary model