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Drupady [299]
4 years ago
14

An element X has two isotopes. X–15 has 7 protons and 8 neutrons. Determine the atomic number and mass number of the second isot

ope, which has 10 neutrons in its nucleus.
a. atomic number = 8; mass number = 9
b. atomic number = 8; mass number = 17
c. atomic number = 7; mass number = 17
d. atomic number = 7; mass number = 15
Chemistry
1 answer:
sveta [45]4 years ago
5 0

c. Atomic number = 7; mass number = 17  

The atomic number of the first isotope is 7.

<em>Isotopes</em> of the same element have the <em>same atomic number</em>, so the atomic number of the second isotope must also be 7.

Mass number = no. of protons + no. of neutrons, or

A = p + n

∴ A = 7 + 10 = 17

Options “a.” and “b.” have the wrong atomic numbers, and option “d.” has the wrong mass number.

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