There are 118 elements in the periodic table, each with a unique symbol and atomic number. Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of ...

Hydrogen is a gas in group IA of the periodic table with atomic number 1, an atomic weight of 1.008, and a density of 0.071. Hydrogen forms an hcp solid at low temperatures, melting at - 259.2 C and ...

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 ...

The seventh row of the table was completed in 2016 when Tennessine, Nihonium, Moscovium, and Oganesson were added. Elements ...

It's what makes one element different from another. The number of protons in an atom is called its atomic number. The atoms of each element in the periodic table have different number of protons ...

For example, the atomic number of sodium is 11. Every sodium atom has 11 protons and 11 electrons. It has 11 positive charges and 11 negative charges. The mass number of an atom is its total ...

It is the principle strengthening element in carbon steels and low-alloy steels. Atomic number 6, atomic weight 12.01115. Manganese (Mn): Manganese is a brittle, metallic element that exists in ...