4th Period: Potassium and Calcium—Electrons go into the fourth energy level. A small piece of sodium metal is placed in water. The sodium reacts with the water and gets very hot, producing sodium ...

The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

and chlorine (Cl), and metal elements like potassium (K), sodium (Na), calcium (Ca) and magnesium (Mg). For example, calcium and phosphorus form a strong foundation for our bones and teeth ...

That universal indicator is showing us that the water now contains an alkali in this case - lithium hydroxide ... elements are called the alkali metals. They include lithium, sodium and potassium ...