{| border="1" cellpadding="2" cellspacing="0" align="right" style="margin-left: 0.5em"
|+ <font size="+1">'''Eigenschaften'''</font>
| colspan="2"  |
{| align="center" border="0"
| colspan="2" align="center" | [[Californium]] - '''Einsteinium''' - [[Fermium]]
|-----
| rowspan="3" | [[Holmium|Ho]]<br />'''Es'''<br />[[Unquadennium|Uqe]]&amp;nbsp;&amp;nbsp;<br>&amp;nbsp;<br>&amp;nbsp;
|-----
| align="center" | <div id="table" style="position:relative;">
{{Periodensystem}}
<div id="text0" style="font-size:12px; font-weight:normal; position:absolute; top:11px; left:27px;">[Rn]5f<sup>11</sup>7s<sup>2</sup></div>
<div id="text2" style="font-size:10px; position:absolute; top:5px; left:140px;">252</div>
<div id="text3" style="font-size:10px; position:absolute; top:15px; left:146px;">99</div>
<div id="text1" style="font-size:20px; font-weight:bold; position:absolute; top:11px; left:160px;">Es</div>
<div id="box2" style="border:solid 1px black; position:absolute; top:60px; left:96px; width:7px; height:9px; overflow:hidden;" />
</div>
<div align="right"><small>[[Periodensystem]]</small></div>
|}
|-----
! colspan="2" bgcolor="#CD2990" | Allgemein
|-----
| Zeichen || Es
|-----
| [[Ordnungszahl|OZ]] || 99
|-----
| langlebigstes [[Isotop]] || 254
|-----
| &amp;nbsp; || [[Transurane]]
|-----
| [[Schmelzpunkt]] || 1133 [[Kelvin|K]] (860 °[[Grad Celsius|C]])
|-----
| [[Siedepunkt]] || -
|-----
| [[Dichte]] || 13,5 g/cm<sup>3</sup> (berechnet)
|-----
| [[Elektronenkonfiguration]]
| ([[Radon|Rn]]) 5f<sup>11</sup>7s<sup>2</sup>
|-----
! colspan="2" bgcolor="#CD2990" | Isotope
|-----
| colspan="2" |
{| border="1" cellspacing="0" cellpadding="2" width="100%"
! [[Isotop|Isotop]]
! [[Natürliche Häufigkeit|NH]]
! [[Halbwertszeit|t<sub>1/2</sub>]]
! [[Radioaktivität|ZM]]
! [[Zerfallsenergie|ZE]] [[mega|M]][[Elektronenvolt|eV]]
! [[Zerfallsprodukt|ZP]]
|-----
| rowspan="2" | <sup>250</sup>Es
| rowspan="2" | {syn.}
| rowspan="2" | 8.6 h
| [[Elektronen-Einfang|e]]
| 2,100
| [[Californium|<sup>250</sup>Cf]]
|-----
| [[Alphastrahlung|a]]
| 6,880
| [[Berkelium|<sup>246</sup>Bk]]
|-----
| rowspan="2" | <sup>251</sup>Es
| rowspan="2" | {syn.}
| rowspan="2" | 33 h
| [[Elektronen-Einfang|e]]
| 0,367
| [[Californium|<sup>251</sup>Cf]]
|-----
| [[Alphastrahlung|a]]
| 6,597
| [[Berkelium|<sup>247</sup>Bk]]
|-----
| rowspan="2" | <sup>252</sup>Es
| rowspan="2" | {syn.}
| rowspan="2" | 471,7 d
| [[Alphastrahlung|a]]
| 6,760
| [[Berkelium|<sup>248</sup>Bk]]
|-----
| [[Elektronen-Einfang|e]]
| 1,260
| [[Californium|<sup>252</sup>Cf]]
|-----
| <sup>253</sup>Es
| [[Synthetisches Radioisotop|{syn.}]]
| 20,47 d
| [[Alphastrahlung|a]]
| 6,739
| [[Berkelium|<sup>249</sup>Bk]]
|-----
| <sup>254</sup>Es
| [[Synthetisches Radioisotop|{syn.}]]
| 275,7 d
| [[Alphastrahlung|a]]
| 6,618
| [[Berkelium|<sup>250</sup>Bk]]
|-----
| rowspan="2" | <sup>255</sup>Es
| rowspan="2" | {syn.}
| rowspan="2" | 39,8 d
| [[Betastrahlung|ß<sup>-</sup>]]
| 0,288
| [[Fermium|<sup>255</sup>Fm]]
|-----
| [[Alphastrahlung|a]]
| 6,436
| [[Berkelium|<sup>251</sup>Bk]]

|}
|-----
! colspan="2" bgcolor="#CD2990" | <small>Soweit möglich und gebräuchlich, werden [[SI-Einheitensystem|SI-Einheiten]] verwendet.<br />Wenn nicht anders vermerkt,<br />gelten die angegebenen Daten bei [[Normbedingungen]].</small>
|}