Elements

This element is radioactive (it puts out rays from its nucleus until it changes into another element, with a smaller nucleus)

This is the least stable element that occurs naturally

This is the last element that was first discovered in nature.

Since it has a half-life of only 22 minutes this element is only ever found in trace amounts

This element has 55 protons

This silver metal melts into a golden liquid at body temperature.

This element explodes the second it touches water

The international standard for the second is based on the inner workings of this element.

This element is used to make the most accurate of all atomic clocks.

This element has 37 protons

This element is soft; silver; and has a very low melting point

It forms hydrogen gas so quickly when it touches water; that the gas burns and dissipates with little drama.

It is the purple in some fireworks

This element is what keeps some atomic clocks accurate.

This element has 19 protons

This element bursts into violet flames the instant it hits water.

Your nerves need this element to transmit signals through your body.

This element is found in salt substitutes; in fertilizers; and in most food.

This element has 11 protons

This element is lighter than water.

If you toss this element into water; it rapidly produces hydrogen gas which promptly ignites and throws flames in all directions.

It is found in table salt; in lights; and in lye

This element is used to supply electrons in chemical reactions.

The elements in this group are all so reactive that they are never found by themselves in nature.

The elements in this group are all soft enough to cut with a knife.

The elements in this group are al silvery; and conduct electricity well.

All of the elements in this group have only one valence electron.