Ground state of Al is 1s²2s²2p⁶3s²3p¹.
Exited state of Al is 1s²2s²2p⁶3s¹3p².
Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!
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Matter? all matter is made of atoms and has mass and volume. i think hope it helps
1:2:6? Ba(NO3)2 +Na2SO4 -----> BaSO4 + 2NaNO3
Ba(NO3)2
BaSO4
NaNO 3
Na2SO4