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10ac Photoelectron fits the description but has 14 letters in the plural.

awesome well all i need is:

10. electrons leaving a surface in response to light waves(13 letters)
14.the number of electrons when the 1s 2s & 3p orbitals are filled.(5 letters)

down:
2. these elements occupy the lowest energy levels first (6 letters)
6. a state in which an electron has absorbed a photon(7 letters)
8. quantum number four(4 letters)
9. a "fingerprint" identifying a particular atom (12 letters)
11. a probability regon for an electron that has a specified shape. (7 letters)
13. won the noble prize in 1904 for work on the noble gases. (6 letters) (I thk the 2nd to last letter is "a")

10. photoemission?
photo...something seems quite likely.
As Helena said - any letters would help,or is this a quiz.
Apologies again Helena, i think Spectrum is a good answer.
i don't see how Ch,4 relates to any of this?

13. Sir William Ramsay.

9d I think this is probably Spectrograph.

13 down, just search "1904 noble prize" and you will find the answer.

11. could be orbital

8 could be spin

I have to say Christina,
the things you are learning here seem quite advanced,surely you can use a search engine,are you delegating?

updated:
this is all i have left:)
some one the letters may or may not be right.. im 75% sure they are right...

Across:
10. electrons leaving a surface in response to light waves(13 letters) (1st letter "p"; 3rd "O")
14.the number of electrons when the 1s 2s & 3p orbitals are filled.(5 letters) (last letter "t")
18. period of the table with largely synthetic elements(7 letters) (last letter "h")

Down:
2. these elements occupy the lowest energy levels first (6 letters)(2nd letter "n")
5. what you get when trying to know the location and the momentum of an electron at the same time. (11 letters) ( 1st letter "N")
6. a state in which an electron has absorbed a photon(7 letters)
8. quantum number four(4 letters) (3rd letter "i")