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The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups. The elements in each group have the same number of valence electrons. As a result, elements in the same group often display similar properties and reactivity.

Hydrogen (H) Helium (He) Lithium (Li) Beryllium (Be) Boron (B) Carbon (C) Nitrogen (N) Oxygen (O)

Each element within the periodic table has its own block. Within these blocks are identifying numbers and letters. The number on the very top is called the atomic number and it represents the number of protons in a single atom of the element. For the element helium (shown above) the atomic number is two.

The periodic table is a classification system for the elements. ... The number below the symbol is the atomic number and this reflects the number of protons in the nucleus of each element's atom. Every element has a unique atomic number. Lead has 82 protons therefore its atomic number is 82.

The periodic table is structured as an 18 X 7 grid, positioned above a smaller double row of elements. The periodic table only lists chemical elements, and includes each isotope of each element within one cell. In the typical periodic table, each element is listed by its element symbol and atomic number.

The periodic table shows the atomic mass and atomic number of each element. The atomic number appears above the symbol for the element and the approximate atomic mass appears below it. The periodic table groups elements according to chemical properties.

The periodic table arranges the elements in rows and columns. In the rows, the elements are placed in order of their atomic number. The columns form groups of elements that have similar chemical properties. For example, certain gases are in one column and metals are in another.

The columns of the periodic table are called groups. Members of the same group in the table have the same number of electrons in the outermost shells of their atoms and form bonds of the same type. The horizontal rows are called periods.

The periodic table is a classification system for the elements. ... The number below the symbol is the atomic number and this reflects the number of protons in the nucleus of each element's atom. Every element has a unique atomic number. Lead has 82 protons therefore its atomic number is 82.