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An isotope of a mystery element has 8 protons, 8 electrons, and 10 neutrons. What

is its mass number?

An isotope of a mystery element has 8 protons, 8 electrons, and 10 neutrons. What-example-1

2 Answers

6 votes

Answer:


\boxed {\boxed {\sf D. \ 18 \ amu}}

Step-by-step explanation:

The mass number is the sum of protons and neutrons.


mass \ number = \# \ of \ protons + \# \ of \ neutrons

This mystery element's isotope has 8 protons and 10 neutrons. Protons and neutrons are both equal to 1 amu, so 8 protons is 8 amu and 10 neutrons is 10 amu.


mass \ number= 8 \ amu +10 \ amu

Add.


mass \ number = 18 \ amu

The mass number of this isotope is 18 atomic mass units.

User DougJones
by
7.8k points
5 votes

Answer:

Fourth Option

Step-by-step explanation:

You find a isotopes mass number by adding the number of protons and neutrons together.


8+10=18

Mass Number = 18amu

The mystery element is the element oxygen because oxygen has 8 protons, 8 electrons and 10 neutrons.

Hope this helps.

User Dead Account
by
8.0k points

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