An ion has three neutrons, four protons, and a charge of positive one. how many electrons are there in the ion?

3

Explanation:

A neutral atom has same number of protons and electrons. Ions dont have the same numbers, if a ion is negative it has more electrons than protons, if a ion is positive it has less electrons than protons.

Then a ion with a charge of positive one, 1 electron less than the number of protons. It has 4 protons so the number of electrons in the ion is 3

We identify an element from its atomic number = number of protons

So here the atomic number is 4 since it says 4 protons present.

The element is Berylllium, Be.

For a neutral atom atomic number = number of protons (positively charged) = number of electrons(negatively charged)

So the neutral atom contains 3 neutrons, 4 protons and 4 electrons.

Mass number = number of protons + neutrons

Since mass of an atom depends on the nucleus (protons and neutrons are present inside the nucleus)

Mass number = 3 + 4  

Mass number=7.

The ion has 1+ charge which means the neutral atom has lost 1 negative electron.

So The answer is  

Ion has 3 neutral neutrons

4 positive protons

3 negative electrons

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)