orbital啥意思?啥意思?“原子ORBITAL”

The first analysis of the orbital dynamics of the fragments suggested that the comet was
originally SOME 2.5 km in diameter with an average fragment diameters of
0.75km.请问那个some是什么意思啊,什么词性啊?

null control的汉语意思,原文标题为“orbital rendezvous and flyaround based on null controllability with vanishing energy”,

英语翻译
1 ,all orbital hold a max of 2 electrons.An orbital containing 2electrons is called a filled orbital
2,Electros occupying the same orbital must have oppisite spin,indicated with arrow ↑↓.
3,electrons fill up orbitals at the lowest energy sublevels first.
4,the lowest or most stable arrangement of electrons in a sublevel is the one with the greatest number of parallel spins(this is Hund` rule)this means when orbitals of the same energy are available ,electrons will avoid pairing if possible ,by entering separate sub-orbitals.
这是第一段了.
还有啊...辛苦了..
the general trend in ionisation energy is for an increase across each period due to the increaseed effective nuclear charge on the valence electrons.However ,we need to explain these first ionisation eneygies that do not follw this trend.
B(硼) has a lower first ionisation energy than Be(pi) the 2p orbital is slightly further from the nucleus than 2s and this greater distance out-weighs the increased effective nuclear charge on the valence electtrons .Thus less energy is required to remove boron`s least toghtly held electrons..
就这么多了 、.