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CHEMISTRY PUZZLE

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