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.Which isotope is produced mainly by nuclear reactors and is used in cancer treatment?
Uranium-238
Write the electronic configuration of Neon
1s² 2s² 2p⁶
If the element is in period number 5, what is its principal quantum number?
5
If Bromine is in period 4, what are its 4 quantum numbers?
n=4; l=3 (0,1,2,3); ml= -3,-2,-1,0,1,2,3; ms=-1/2
If Calcium is in period 4, what is the shape of its orbital?
flower
What are 4 sublevels?
s,p,d,f
how many orbitals does sublevel f have?
7
What is the maximum number of electrons can sublevel d occupy?
10 electrons
Which statement explains why two electrons in the same orbital must have opposite spins?
Pauli exclusion principle
The electron configuration of an element is 1s² 2s² 2p⁶ 3s² . Which element is this?
Magnesium
Which quantum number determines the shape of an orbital?
azimuthal quantum number (l) or angular momentum quantum number (l)
Which law states that the physical and chemical properties of elements are periodic functions of their atomic numbers?
Modern Periodic Law
Write 0.003700 in scientific notation with 3 significant figures.
3.70 × 10⁻³
If an electronic equipment slowly producing consistently higher readings over time, what type of error is it?
systematic error
What type of error describes slight variations in reaction time when starting/stopping a timer?
random error
It refers to how close a measurement is to the true or accepted value.
Accuracy
