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neutral implies # of electrons =# of protons
so for oxygen protons = 8
isotopes have equal number of protons but differ in # of neutrons, so that affects the mass since:
protons + neutrons = atomic mass
That doesn't answer the question tho
it's not in a short for way, but I'm sure you can take the concepts and reword them
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I can't. I don't understand and nither does my mom.
okay, you know what an atom is composed of right? electrons, protons and neutrons.
electrons are negatively charged, while protons are positively charged. Neutrons, as their name implies, are neutral.
The mass of a protons is close to that of a neutron, so they have, arbitrarily, been given mass of 1 g/mol (this is derived from the Hydrogen atom since it only contains 1 proton)
The number of protons in an atom defines what atom it is, so if you have 8 protons you know that you have oxygen, if you change that number, the element changes.
isotopes differ in the number of neutrons they have in the nucleus and affects the mass.
so for neutral Oxygen (it implies that it as 8 protons and 8 electrons since charges have to equal) it's isotope will have the same number of protons and electrons but have a different number of neutrons and, thus, it will have a different mass.
The distinction is like between "a 9th grader" and "someone born in 1999." An oxygen atom is like a 9th grader: it identifies atoms that all share the most important characteristic of atoms, which is the number of protons. All oxygen atoms have 8 protons, just like all 9th graders have completed eighth grade.
However, oxygen atoms may differ in the number of neutrons in their nuclei, just as 9th graders may differ slightly in what year they were born: most are born in 1999, but some are born in 1998 or 2000. In the same way, most oxygen atoms have 8 neutrons, but a few have 9 or 10. The different isotopes of oxygen are the different types of oxygen with different numbers of neutrons: the isotope with 8 neutrons, the most common, is called oxygen-16 (8 protons + 8 neutrons = 16 nucleons). The isotope with 9 neutrons is called oxygen-17, and that with 10 is called oxygen-18.
You may wonder, if you have some oxygen, which do you usually have? The answer is that ordinarily oxygen comes as a mixture of isotopes, as do al other elements. With great work you can prepare a pure isotope, if you need one.