Answer: Magnesium
Explanation:
Sodium, number of electrons= 11
Aluminum, number of electrons= 13
Magnesium, number of electrons= 12. which is greater than sodium but less than aluminum.
A controlled experiment is simply an experiment in which all factors are held constant except for one: the independent variable. A common type of controlled experiment compares a control group against an experimental group. All variables are identical between the two groups except the factor being tested.
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I search it in the internet so here you go
Here we go ~
Energy difference btween the two electronic states can be expressed as :
[ h = planks constant,
= frequency ]
