Question

How many protons would a positively charged isotope ions of O-18 have?

Answer 1

It would have

8

protons.

Explanation:

Elements are distinguished by the number of protons in their nucleus. This number is called the atomic number, and for Oxygen, it is

8

.

Thus, any atom of Oxygen, whether positive or negative, will have

8

protons. If it is positively charged, this simply means that it has

<

8

electrons such that the net charge is positive.

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Answer 2

$\huge\red{Answer}$

Oxygen is the element with atomic number 8. That means all atoms of oxygen (no matter which isotope) have 8 protons. 18-O has a mass number of 18. The mass number is simply the sum of the protons and neutrons in the nucleus, so 18-O has 18 - 8 = 10 neutrons. The other stable isotopes of oxygen are 16-O (the most abundant isotope), which has 16-8 = 8 neutrons, and 17-O (least abundant), which has 17 - 8 = 9 neutrons. 

Atoms become ions by gaining or losing electrons. An ion has the same number of protons (and neutrons) as the neutral atom, so all ions of any isotope of oxygen have 8 protons.

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