Question

Which of the following elements is the most reactive?

Potassium
Lithium
Sodium
Rubidium

Answer 1

Among the four elements mention in the question,the potassium is the most reactive element.

•The reactivity of a chemical element is dependent upon several factors

• Similarly, the the distance between the nucleus of an atom and the outermost shell of electron is also an important factor behind the reactivity of an element.

Distance between a nucleus and the outermost electronic shell is directly proportional to the reactivity of an element.

• And, among the four elements mentioned in the question,the potassium has the longest distance way to wear a nucleus and outermost electron shell.

That's why potassium is the most reactive element.

Answer 2

Rubidium is the "most reactive" among all of them.

Option D

Explanation:

• Rubidium is placed lower in the column and to the right most in the row from the following mentioned elements in the option.
• In the periodic table, the elements in the lower column have greater outer shell and number of electrons than the upper elements or that in the left side of the row.
• The presence of more outer shells with free electrons make it easy to react.  

To know more:

Who is thr most reactive element in the periodic table. and why?

https://brainly.in/question/1433888