The atomic number is the variety of protons in the nucleus, so the atomic number is #10# (i.e. An atom of neon, #"Ne"#).
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The mass number is the total number of nucleons, which is the variety of protons to add the variety of neutrons.
We"re not provided how numerous neutrons space in the atom, so we can"t necessarily know this..
Additionally, if we wanted to number out the ionic charge that this atom, us subtract the number of electrons from the variety of protons:
#"ionic charge" = 10-12 = ul(-2#
#Z#, #"the atom number"#, mentions the number of protons, positively charged, enormous particles, existing in in the element"s nucleus. #Z# specifies the identity of the atom. If #Z=10#, we gots the element #"neon"#.
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The NEUTRAL element contains precisely the same variety of negatively charged extra-nuclear particles, that room conceived come whizz about the nuclear core; and also of food these room the #"electrons"#. And thus we have actually a an extremely unusual ion here, because there are an ext electrons than protons, and the atom particle thus has an connected electric charge, i.e. Here we gots #Ne^(2-)#, or #""^20Ne^(2-)# come specify a likely individual isotope.
Atomic mass relies on the number of nucular particles, the previously mentioned protons, but additionally #"neutrons"#, huge nuclear particles of ZERO electrical charge, that likewise comprise the nucleus. Interactions between protons and also neutrons, in ~ impossibly quick nuclear ranges, are solid enuff to overcome electrostatic repulsion in between like charges, and also bind the cell core together. This is something you won"t learn about in a chemistry class. Because that #""^20Ne# we have actually assumed the the nucleus includes 10 neutrons; were 11 neutron present, us would have #""^21Ne#.
Historically, the electrons to be assigned a an adverse electric charge. The would have actually been so much much more convenient, had actually electrons been assigned a confident charge, and thus protons would certainly have as such been assigned a an unfavorable charge. The would have actually saved generations the quantum chemists from gaining the appropriate magnitude but wrong sign in your answer, just since they counting odd rather of even or angry versa in your calculations on countless electron systems. The course, the particle physicists would complain, but they room weird enuff, and couple of enuff in number to address the change. C"est la vie.