How many protons and electrons are present in the mg2+ ion? 1. 14 protons, 14 electrons 2. 12 protons, 10 electrons 3. 12 protons, 12 electrons 4. 14 protons, 12 electrons 5. 10 protons, 12 electrons 6. 10 protons, 14 electrons 7. 14 protons, 10 electrons 8. 12 protons, 14 electrons 9. 10 protons, 10 electron?

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 Mg2+ 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 24Mg. 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. 25Mg has 13neutrons, 26Mg has 14 neutrons. 24Mg is most likely being referred to in the question, though.

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.