An atom has 25 protons, 30 neutrons, and 25 electrons. What ls the charge of the atom's nucleus?
Unless you mistyped the question, the answer should be
Basic atomic structure has protons and neutrons located in the nucleus and electrons surrounding the nucleus.
Your atom is said to contain
This means that regardless of what atom we're talking about, its nucleus will always carry a positive charge.
The net charge of the atom is given by the ratio of protons to electrons, which as you know are negatively charged particles.
You can thus say that if an atom has
- more electrons surrounding its nucleus than protons located in its nucleus
#->#it will carry a negative charge
- more protons located in its nucleus than electrons surrounding its nucleus
#->#it will carry a positive charge
- equal numbers of protons and electrons
#->#it will be neutral
Now, if you're interested in the charge of the atom's nucleus, all you have to do is imagine that you're taking away all the electrons that it has surrounding its nucleus.
In this case, the starting atom is neutral, since you have
#"25 protons / 24 electrons" -> 1+ #charge #"25 protons / 23 electrons" -> 2+#charge #"25 protons / 22 electrons" -> 3+#charge #"25 protons / 21 electrons" -> 4+#charge
and so on. By the time you take away the last electron, you'll be left with a
If the question actually asks for the charge of the atom, then the equal number of protons and electrons tells you that you're dealing with a neutral atom.