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Question:

effective nuclear charge?

what is the effective nuclear charge on the 1s electron of a neutral Al atom?

Answer:

Keep it in the oven! Stick a baking needle (even a clean knitting needle works) into the middle to make sure it is finished, when pulling it out nothing should stick to itBon Appetite!
If you haven't taken it out of the oven yet, leave it in for 5 minutes or so, checking to see if it's done by sticking a clean toothpick in the centerIf it comes out clean, it's doneIf still wet batter on it, leave it a few more minutes can check againIf you have taken it out and it;s cool-you can scoop out the raw part and fill it with pudding, or other filling, or cake crumbs mixed with enough frosting to bind it and use it as a Mystery filling!
All you do is put it back into the oven and stick something like a toothpick, fork, or knife and if it's clean, you can take it out of the oven and you can eat itAnd the reason why it probably didn't cook at all in the inside when the time in cookbook is when it's supposed to be done is because all ovens are different, so times on a cookbook are more like references (as I see it.) Just wondering though, but is the temperature correct? some people just forget (I do that a lot! XD)
Keep it in the oven until the center of the cake bounces when you tap it in the middle with your finger or stick a tooth pick into the center.if it comes out clean, it is doneYou may want to turn the oven down 25 degreesIt may be cooking to fast on the edgesIt will take longer to bake this way, but the cake won't burn on the outside edges before it is done in the middleIn fact, I always bake my cakes on 325 instead of 350 degreesThey don't rise as much and they don't get crisp in the corners.
Aluminum has 13 protonsThe effective nuclear charge on an electron refers to the number of protons minus the number of electrons between the nucleus and the electron in questionSince the electron in question is in the innermost orbital (closest to nucleus) there are no electrons between it and the nucleus and the effective charge is +13.

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