1. "Iodine" by Carl Sandburg:
```
Iodine burns like fury
In the white throat of the chemist.
It is a brown gas
That comes from the sea
But it is a medicine
For the throat of man.
It will heal the sick
And make the strong stronger.
It is the friend of man,
Iodine.
```
2. "The Element Iodine" by Mary Oliver:
```
Iodine: a non-metal
halogen, atomic number 53,
atomic mass 126.90447.
A dark violet solid,
lustrous, crystalline,
with a sharp, irritating odor.
Used in medicine,
as an antiseptic,
in photography,
as a contrast agent,
and in the production of
iodized salt.
A rare but essential element,
iodine is found in seawater,
in seaweed,
and in some soils.
It is a trace element
necessary for human health,
and it is required for the
synthesis of thyroid hormones,
which regulate the body's
metabolism.
Iodine is a gift
from the sea,
a necessary element
for life.
```
3. "Ode to Iodine" by Langston Hughes:
```
Iodine, iodine,
You are the salt of the sea.
You keep us healthy and strong,
And we are grateful for you.
You are used in medicine,
To heal wounds and prevent infection.
You are used in photography,
To make beautiful pictures.
You are used in industry,
To make dyes and explosives.
You are used in agriculture,
To help plants grow.
You are a versatile element,
Iodine, and we are glad you exist.
You make our lives better in so many ways,
And we thank you for your gifts.
```
These poems highlight the significance of iodine in various aspects of life, from its medicinal properties to its industrial applications. They recognize iodine as an essential element that contributes to human health and well-being, while also celebrating the wonders and diversity of the chemical world.