The atomic number of u-235 is and the mass number is
a. 92, 235
b. 92, 146
c. 92, 143

U – 235 have the atomic number of 92 with a mass number of 235.

Option A

Explanation:

In general, an atomic number of any element is measured by knowing the number of proton count present in the element. Here we have 92 as protons count of uranium in the nucleus. The total counts of neutron and proton number is denoted as mass numbers.

mass number=number of proton+number of neutron

number of neutron=143

number of proton=92

mass number=92+143=235.

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