Sonya reads the element riddle below.

i am shiny. i form +1 ions. there’s more!
i am the most reactive metal in period 4.
who am i?

which element is the answer to the riddle?
krypton
potassium
sodium
bromine

The correct answer is potassium.

Explanation: There are 3 types of elements in the periodic table: metals, non-metals and metalloids.

Reactivity of an element is defined as the tendency of loosing or gaining electrons easily.

We are given in the question that the element is shiny and form +1 oxidation state. From this, we can easily say that the element is a metal.

This element is the most reactive in Period 4.

A metal which is most reactive in Period 4 and forms +1 oxidation state is Potassium.

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

the correct answer to this question is 2