Elements in the same period of the periodic table have sequentially increasing numbers of protons.
Representative Elements
The periodic table
The Russian chemist Dmitri Mendeleev was the first person to arrange all elements into families. He created the periodic table of elements and wrote a textbook between 1868 and 1870.
He arranged the elements in order of atomic number.
What is the name of the collection of elements on the right side of the periodic table with electrons sequentially filling orbitals in their valence?
Elements in the same period of the periodic table have sequentially increasing numbers of protons.
Meneleev arranged the elements
The elements are arranged in what is called the periodic table.
When the elements... ... are not sorted ... have different sizes ... are only sequentially accessible
The Periodic Table of Elements.
Atomic Mass.
Representative Elements
mendelev arranged the elements in the periodic table in the asending order of the mass number of elements.
Dmitri Mendeleev
The periodic table
The mass of the elements