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Which alkaline earth metal has 3 occupied energy levels?

The alkaline metal with three rings would be magnesium(Mg). It has an atomic number of 12 and atomic mass if rounded is 24. Protons and eletrons are 12 (Electrons are always the same number as protons and the number of protons is the same as the atomic number)and Neutrons( found out by subtracting the atomic mass from the number of protons) is 12. It would have 3 rings because there are 12 electrons. So, 2 electrons can be in the first orbit, 8 in the second, and 8 in the third. Basically you must fill up the first and second orbit and then in the third you have only 2.


What is the value of a 1990 K-Mart Mark McGwire card number 32?

A 1990 K-Mart Mark McGwire card number 32 has a book value of about $1.00 in near/mint -mint condition. This price is for the correct card not the error card. Professionally graded cards will sell for more. Condition is important. Common flaws with baseball cards include: rounded edges, creases, off centered, and faded color. Any or all flaws will devalue the card significantly.


What is the name of the nearest star to the earth?

The center of our solar system is the Sun. The Sun is a star.The nearest star to the Sun is Proxima Centauri, a red dwarf about 4.24 light-years from the Sun.


How can you determine the number of neutrons in an isotope?

One doesn't generally "calculate" the number of neutrons. The number of neutrons in an atom is always equal to the number of protons, and the number of protons can be found on the Periodic Table of Elements, which can easily be found on the internet or in a science textbook.


How do you figure out the subatomic particle numbers for each element?

Number of protons= Atomic number Number of neutrons= Mass number-Atomic number Number of electrons=Number of protons (If there is no charge on the atom)