Use the portion of the periodic table to answer the questions

Part 1: Elements with the same properties as calcium

Two elements that have the same properties as calcium are magnesium and strontium. Elements in the same group share the same properties because they have the same number of electrons in the outermost electron shell.

Part 2: Protons, Electrons, and Neutrons in Sodium Atom

For sodium, the atomic number is 11 and the atomic mass is approximately 23. The number of protons and electrons in an atom is indicated by the atomic number, which is 11 in the case of sodium. Since atoms are electrically neutral, the number of protons is equal to the number of electrons. The atomic mass represents the sum of protons and neutrons in the nucleus. Therefore: number of neutrons = atomic mass - atomic number = 23 - 11 = 12.

So, for the sodium atom, there are 11 protons, 11 electrons, and 12 neutrons.

Understanding the atomic structure and properties of elements from the periodic table is essential in determining their characteristics and behavior.