View synonyms for magic number

magic number

noun

, Physics.

magic number

physics any of the numbers 2, 8, 20, 28, 50, 82, and 126. Nuclides with these numbers of nucleons appear to have greater stability than other nuclides
chem a number of atoms that is particularly stable in certain types of compound that have clusters of the same type of atom

magic number

/ măj′ĭk /

Any of the numbers, 2, 8, 20, 28, 50, 82, or 126, that represent the number of neutrons or protons in strongly bound and exceptionally stable atomic nuclei. The existence of such stable nuclei is explained by assuming a shell structure for nucleons, much like the shell structure of electron orbitals around the nucleus.

Discover More

First recorded in 1945–50

Discover More

This magic number was arrived at after one candidate was interviewed separately by 18 different people—and then rejected.

The result was “Three is a Magic Number,” still my favorite Schoolhouse song.

“Three is a Magic Number” becomes stunningly poignant to any couple that welcomes its first child.

“We dickered back and forth and settled on .86 percent, not because it was a magic number,” said Hastert.

The challenger needs 64 or more, and the incumbent, 69 or more, to get to the magic number of 270.

Turning away from the curious throng, Mark cupped his hand, then together they all three peered at that magic number.

The ring becoming seven mountains suggests with its magic number an Oriental origin.

Its letters make up the magic number 365, supposed to represent the number of spirits subject to the supreme being.

Some conjurers say that number three is the magic number, and some say number seven.

I speak of Thirteen lands; and thirteen is as it were a magic number in the history of federations.

Browse