Calcium is a metal in group IIA of the periodic table with atomic number 20, an atomic weight of 40.08, and a density of 1.55 Mg/m 3. Its melting point is 838 C, and it boils at 1440 C. The electronic ...

After the third energy level has 8 electrons, the next electron goes into the fourth level. 4th Period: Potassium and Calcium—Electrons go into the fourth energy level. A small piece of sodium metal ...

When a metal reacts with water, hydrogen gas is produced and this can catch on fire. The diagram shows four different metals reacting with water: A - Lithium (Li) B - Calcium (Ca) C - Silver (Ag ...

Hard water is the type of water that has high mineral content (in contrast with soft water). Hard water minerals primarily ...