Longest-lived isotopes and half-lives for 101–118

Question 1

Element 101 (Mendelevium) — longest-lived isotope and half-life?

Accepted Answer

Md-258 — 51.5 days

Question 2

Element 102 (Nobelium) — longest-lived isotope and half-life?

Accepted Answer

No-259 — 58 minutes

Question 3

Element 103 (Lawrencium) — longest-lived isotope and half-life?

Accepted Answer

Lr-262 — 3.6 hours

Question 4

Element 104 (Rutherfordium) — longest-lived isotope and half-life?

Accepted Answer

Rf-267 — ~1.3 hours

Question 5

Element 105 (Dubnium) — longest-lived isotope and half-life?

Accepted Answer

Db-268 — ~16 hours

Question 6

Element 106 (Seaborgium) — longest-lived isotope and half-life?

Accepted Answer

Sg-269 — ~14 minutes

Question 7

Element 107 (Bohrium) — longest-lived isotope and half-life?

Accepted Answer

Bh-270 — ~61 seconds

Question 8

Element 108 (Hassium) — longest-lived isotope and half-life?

Accepted Answer

Hs-269 — ~9 seconds

Question 9

Element 109 (Meitnerium) — longest-lived isotope and half-life?

Accepted Answer

Mt-278 — ~8 seconds

Question 10

Element 110 (Darmstadtium) — longest-lived isotope and half-life?

Accepted Answer

Ds-281 — ~11 seconds

Question 11

Element 111 (Roentgenium) — longest-lived isotope and half-life?

Accepted Answer

Rg-282 — ~110 seconds

Question 12

Element 112 (Copernicium) — longest-lived isotope and half-life?

Accepted Answer

Cn-285 — ~29 seconds

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