Question

in the periodic table, most of the elements are radioactive after

Answer 1

Answer:

ElementMost Stable IsotopeHalf-life

of Most Stable IsotopeTechnetiumTc-914.21 x 10 6 yearsPromethiumPm-14517.4 yearsPoloniumPo-209102 yearsAstatineAt-2108.1 hoursRadonRn-2223.82 daysFranciumFr-22322 minutesRadiumRa-2261600 yearsActiniumAc-22721.77 yearsThoriumTh-2297.54 x 10 4 yearsProtactiniumPa-2313.28 x 10 4 yearsUraniumU-2362.34 x 10 7 yearsNeptuniumNp-2372.14 x 10 6 yearsPlutoniumPu-2448.00 x 10 7 yearsAmericiumAm-2437370 yearsCuriumCm-2471.56 x 10 7 yearsBerkeliumBk-2471380 yearsCaliforniumCf-251898 yearsEinsteiniumEs-252471.7 daysFermiumFm-257100.5 daysMendeleviumMd-25851.5 daysNobeliumNo-25958 minutesLawrenciumLr-2624 hoursRutherfordiumRf-26513 hoursDubniumDb-26832 hoursSeaborgiumSg-2712.4 minutesBohriumBh-26717 secondsHassiumHs-2699.7 secondsMeitneriumMt-2760.72 secondsDarmstadtiumDs-28111.1 secondsRoentgeniumRg-28126 secondsCoperniciumCn-28529 secondsNihoniumNh-2840.48 secondsFleroviumFl-2892.65 secondsM oscoviumMc-28987 millisecondsLivermoriumLv-29361 millisecondsTennessineUnknownOganessonOg-2941.8 milliseconds

Explanation:

hope it will help you

Answer 2

the correct answer is lead