One of the most metallic metals named for its sky blue spectral lines atomic clocks using this element are accurate to 5 seconds in 300 years or 1 second 60 years?

The element that best matches this description is strontium.

Strontium is a silvery-white metal that is highly reactive and forms a dark oxide layer in air. It is one of the most metallic metals, with a low electrical resistivity and a high thermal conductivity. Strontium has a melting point of 769 °C and a boiling point of 1382 °C.

The most notable characteristic of strontium is its sky-blue spectral lines. These lines are so distinct that they are used to define the meter in the International System of Units (SI). Atomic clocks using strontium atoms are extremely accurate, with an accuracy of 5 seconds in 300 years or 1 second in 60 years.

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