Question #47128

1 Answer
Mar 11, 2017

Answer:

There are #12# protons and #10# electrons in a #"Mg"^(2+)# ion, the normal amount of neutrons is #12#.

Explanation:

Magnesium is an element with atomic number #12#. This means that every magnesium atom will have #12# protons.

In a magnesium atom, there are #12# electrons, to make the atom have a neutral charge. When an ion is formed, the magnesium atom loses electrons. The #2+# charge shows that the magnesium ion has two more protons than electrons. The proton number for magnesium does not change, so #"Mg"^(2+)# must have two less electrons, i.e. #10# electrons.

The number of neutrons varies among different isotopes of magnesium. An isotope of an element means it just has different amounts of neutrons.

The most common isotope of magnesium is #""^24"Mg"#. This #24# indicates the total number of protons and neutrons. Magnesium has #12# protons, so must have

#24 - 12 = "12 neutrons"#

Other isotopes of magnesium have different numbers of neutrons, i.e. #""^25"Mg"# has #13# neutrons, #""^26"Mg"# has #14# neutrons. #""^24"Mg"# is most likely being referred to in the question, though.

I hope this helped!