Which of the following is true about an atom of iron and an atom of copper?

they have different masses.
both have the same properties.
they have an equal number of protons.
both have different types of sub-atomic particles.

the answer is "a.) well–developed vascular system."

explanation:

the alkaline earth metals (beryllium (be), magnesium (mg), calcium (ca), strontium (sr), barium (ba), and radium (ra)) are a group of chemical elements in the s-block of the periodic table with very similar properties: shiny. silvery-white. hopefully this ? i didn't fully understand the question