The nuclear symbol for uranium-235 should be written as O U-235.
225
92 U
233
143U
OU

²³⁵₉₂U

Explanation:

The right symbol for the nuclei is ²³⁵₉₂U;

 For this chemical element, the atom is represented by the symbol U;

 To the superscript before the symbol is the mass number

 The subscript before the symbol is the atomic number

Mass number is the number of protons and neutrons

Atomic number is the number of protons.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

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