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What are the first 20 elements in the periodic table and their significance?

Hydrogen (H) is the most abundant element in the universe, making up about 75% of all normal matter.

Helium (He) is the second most abundant element in the universe and is the only element that was discovered first in the Sun's atmosphere before being found on Earth.

Lithium (Li) is the least dense solid element and is used in batteries, glass, and ceramics due to its high reactivity.

Beryllium (Be) is a lightweight metal that is used in spacecraft, defense equipment, and X-ray equipment due to its high stiffness and strength.

Boron (B) is essential for plant growth and plays a role in human bone development, but can be toxic in high amounts.

Carbon (C) is the basis for all known life on Earth and is a key component of DNA, proteins, and the human body.

Nitrogen (N) makes up 78% of the Earth's atmosphere and is essential for plant growth and animal life.

Oxygen (O) is the most abundant element in the Earth's crust and is necessary for most life on the planet.

Fluorine (F) is the most electronegative element, meaning it has a strong tendency to acquire electrons and form compounds.

Neon (Ne) is used in signs and lamps due to its bright, reddish-orange glow when electrically charged.

Sodium (Na) is an essential mineral for human health, but can be explosive when combined with water.

Magnesium (Mg) is crucial for bone development and energy production in the body.

Aluminum (Al) is the most abundant metal in the Earth's crust and is used in a wide range of products, from cans to aircraft.

Silicon (Si) is the second most abundant element in the Earth's crust and is a key component of computer chips and glass.

Phosphorus (P) is essential for bone health and energy production in the body, but can be toxic in high amounts.

Sulfur (S) is a critical element for life, playing a role in protein structure and enzyme function.

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