Potassium is an alkali metal in group IA of the periodic table with atomic number 19, an atomic weight of 39.102, and a density of 0.86 Mg/m 3. Its melting point is 63.7 C, and it boils at 760 C. The ...

Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table’s arrangement also allows scientists to discern trends in ...

The periodic table that we follow for our studies is the Modern Periodic Table, which is based on atomic number rather than atomic mass. This arrangement was established by the British physicist ...

For example, lithium (Li), sodium (Na) and potassium (K ... However, the modern periodic table arranges the elements by increasing atomic number, rather than atomic mass. Mendeleev recognised ...

The atom with eight protons in its nucleus (atomic number 8) is oxygen ... the next electron goes into the fourth level. 4th Period: Potassium and Calcium—Electrons go into the fourth energy level. A ...