* Alkaline Earth Metals: These are found in Group 2 of the periodic table. Examples include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
* Neutrons: The number of neutrons in an atom can vary, creating isotopes of the same element.
* To find the element: You'll need to know the element's atomic number (number of protons). Since all atoms of a given element have the same number of protons, this will help you identify the correct alkaline earth metal.
Here's how to solve the problem:
1. Atomic Mass: The number of neutrons plus the number of protons equals the atomic mass.
2. Finding the Element: Look up the atomic masses of the alkaline earth metals. The one with an atomic mass closest to (number of protons) + 20 will be your answer.
Let's try it with an example:
* Calcium (Ca): Calcium has an atomic number of 20 (20 protons). Adding 20 neutrons gives us an atomic mass of 40.
Therefore, calcium (Ca) is the alkaline earth metal with 20 neutrons.
