During a collision, the person would most likely experience the same conditions with or without a seatbelt.
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Non metals could be:
pencils
books
paper
metals could be:
pens
Tablet/Phone
The fourth combination is not allowed.
The third quantum number, i.e. m subscript l, only may an integer number from -l to + l. Given that l = 0, the only allowed m subscript l is 0.