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Chemistry Puzzle

Across
Subdivision of electron shell separated by electron orbitals
Metal with atomic number 50 and symbol Sn.
Number of electrons=number of protons=…...…..
An element with atomic number 53.
An element with configuration 1s2 2s1.
Valance electrons of central atom in a compound which are not involved in bonding
This element has three isotopes: protium, deuterium and tritium
Down
A sub atomic particle discovered by J.J Thomson
An element with configuration[Ne]10 3s2 3p3
Metal with atomic number 39.
Who discovered proton?
AMU stands for atomic...….....unit.