Elemental Limericks, Part 12

Roentgenium’s in, so we’re told,
A homologous series with gold,
In addition to copper
And silver, but proper
Experiments still are on hold.

Copernicium, chemists suspect,
Might just give up its 6d elect-
Rons instead of the ones
7s as they’ve spun
Due to relativistic effects.

Nihonium’s named for Japan,
As indeed it was made in that land,
Though a Russian-Amer-
Ican team claims that they’re
The first makers. These scientists, man.

Flerovium’s named for a lab.
In theory, some isotopes have
Rather lengthy decay
For how much they must weigh,
But for now, we can just take a stab.

Moscovium’s last in the group
Called pnictogens. What is the root?
Ancient Greek for “to choke,”
As their gas is no joke.
At least, nitrogen isn’t a hoot.

Livermorium first got its name
Twelve years after production and fame
More than twenty years since
Attempt 1 could evince
None at all (there’s a science time frame).

Tennessine is the latest of finds
In the table, at least at the time
Of this poem I wrote,
But it’s not the last note:
There’s a heavier entry behind.

Oganesson’s so rare only five
Atoms ever were known to arrive.
It furthermore stands
Out as named for a man
Who, though elderly, still is alive.