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 ...

Calcium is found on the left of the periodic table, surrounded by other metals. Calcium has the usual properties of a metal. For example it is a good conductor of heat and electricity. Gethin ...

February 7 is National Periodic Table Day, when we celebrate the efforts of scientists over the centuries to figure out how different elements ...

For elements in the first three periods of the periodic table (hydrogen - argon), the orbitals can simply ... Potassium has an atomic number of 19. For potassium and calcium, the 4s orbital dips in ...