Which Joe gave his name to ‘sloppy joes’? We look at five interesting sandwiches and their lexical origins.
The total number of protons and neutrons in a nucleus.
- ‘Mathematical calculations employing the proportions and mass numbers have assigned titanium a mean atomic weight of 47.88.’
- ‘The mass number gives you the total number of protons and neutrons in the nucleus of that element.’
- ‘The sum of the protons and neutrons is called the mass number.’
- ‘Different isotopes of the same element have different mass numbers because their nuclei contain different numbers of neutrons.’
- ‘Various numbers are used to define nuclei: the atomic number, Z, is the number of protons, while the mass number is the sum of the atomic number and the number of neutrons, N.’
mass number/ˈmas ˌnəmbər/
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Before you run for the hills, let’s run through a list of ‘run’ expressions that are running through our minds.
The definitions of ‘buddy’ and ‘bro’ in the OED have recently been revised. We explore their history and increase in popularity.