Question

X: An atom with a mass number of 238 has 92 protons and 146 neutrons.

Y: An atom with a mass number of 234 has 92 protons and 142 neutrons.

Answer 1

Answer:

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Answer 2

Element X has atomic number 92 as number of protons = number of electrons = atomic number.that is uranium.

Element Y has atomic number 92 , the element in uranium.

Explanation:

Both these are isotopes of uranium.. uranium -234 and uranium - 238.

Uranium has two primordial isotopes, uranium-238 and uranium-235, that have long half-lives and are found in appreciable quantity in the Earth's crust. The decay product uranium-234 is also found.Naturally occurring uranium is composed of three major isotopes, uranium-238 (99.2739–99.2752% natural abundance), uranium-235 (0.7198–0.7202%), and uranium-234 (0.0050–0.0059%).[2] All three isotopes are radioactive (i.e., they are radioisotopes), and the most abundant and stable is uranium-238, with a half-life of 4.4683×109 years (close to the age of the Earth).

Uranium-238 is an alpha emitter, decaying through the 18-member uranium series into lead-206