On 29/07/2021 12:46, Phil Allison wrote:
> Trevor Wilson wrote:
> ==================
>>
>> **Oops. Should read: "Silicon is an ELEMENT,...."
>>
>
> ** I found Farnell's new name confusing at first.
>
> That Silicon had atomic number 14 did not spring to mind.
> What did was Carbon 14.
That's the mass number of that isotope, counting the protons plus
neutrons. (very nearly the atomic mass also)
> Mentioned constantly in TV programs in relation " carbon dating " of antiquities.
>
> FYI Carbon is element 12.
It's element 6 (atomic number is 6) - only count the protons for the
atomic number. Carbon-12 has a mass number of 12, and it is special
because its atomic mass is also defined to be exactly 12 and used as the
reference when measuring the other atomic masses accurately.