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omg thank you so much can u find the others.. if it helps....
the subject is chemistry and ch.4 :)

anyone elese please i need the answers?<33

9 spectral line(if it can be two words)

could 12 be as simple as Rainbow?

3. spectrum

spectrum is included in the clue,(and is 8 letters)
Visible is my best guess (from "Visible spectrum")

sorry Helena, i was fixating on clue 12,and your answer gave me my last answer(visible).
x

trevor
the answer spectrum related to
3d means "a range" (8)
I thought that it could be a trick question and thought that it may be too obvious.

Christina
Have you got any letters towards the rest of the answers?

ok Trevor.

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")