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Chemistry 6 Online
OpenStudy (anonymous):

If the atomic number of an neutral atom is 25 then how many protons will be in the same atom?

OpenStudy (aaronq):

the number of protons defines the identity of an atom. It never changes through chemical reactions (only through nuclear reactions) and if it does it's not the same element.

OpenStudy (anonymous):

what if I am not given the atomic number?

OpenStudy (anonymous):

If the atomic number of an neutral atom is 25 then how many protons will be in the same atom? If there are 77 electrons in a neutral atom then how many protons will be in the same atom? A neutral atom with a mass number of 105 and an atomic number of 45 will have how many electrons? Identify the symbol of a neutral atom containing 35 electrons. What is the mass number of an atom with an atomic number of 30 and 32 neutrons? An isotope of a neutral atom has 19 electrons and 22 neutrons? Give the atomic symbol of the element.

OpenStudy (anonymous):

this is all of them they are combined as 1 question

OpenStudy (aaronq):

atomic number = number of protons. In a neutral atom, the # of electrons = # of protons, This makes sense because they're oppositely charged, if there was less or more electrons the atom wouldn't be neutral (and in fact it would be called an "ion").

OpenStudy (aaronq):

mass number = # of protons + # of neutrons

OpenStudy (anonymous):

thanks!

OpenStudy (aaronq):

no problem dude !

OpenStudy (anonymous):

I got the third one wrong, any idea?

OpenStudy (aaronq):

"A neutral atom with a mass number of 105 and an atomic number of 45 will have how many electrons?" this one?

OpenStudy (anonymous):

yes! I tried 60 but it was incorrect

OpenStudy (aaronq):

they're asking for the number of electrons not neutrons. if it's neutral atom, then # of electrons = # of protons

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