Fluorine has the highest electronegativity value of 3.98 on the Pauling scale, making it the most electronegative element.

This is because it has the smallest atomic radius and the highest effective nuclear charge among all elements, causing it to attract electrons most strongly in a chemical bond.

A solar eclipse happens when the Moon's orbit places it directly between Earth and the Sun, creating a shadow on Earth's surface.

This is distinct from a lunar eclipse where Earth blocks sunlight from reaching the Moon, and from penumbral or annular eclipses which are specific types with different characteristics.

Water = H₂O.

Heart pumps blood.

First law = Law of Inertia.

In chloroplasts of leaves.

Carbon atomic number = 6.

Sunlight → Vitamin D synthesis.

Current measured in Amperes.

DNA = Deoxyribonucleic Acid.