Johann Wolfgang Dobereiner,a German chemist arranged atom in the form of triads in 1817.
Dmitri Mendeleev arranged the elements into triads in the periodic table. Mendeleev noticed that elements with similar properties occurred at regular intervals when arranged by increasing atomic mass.
Protons and neutrons form the nucleusof the atom with electons orbiting it
Protons and neutrons form the nucleusof the atom with electons orbiting it
Protons and neutrons form the nucleusof the atom with electons orbiting it
Protons and neutrons form the nucleusof the atom with electons orbiting it
Protons and neutrons form the nucleusof the atom with electons orbiting it
Electrons are arranged in shells around the atom.
electrons are arranged in energy levels, or shells, around the nucleus of an atom.
Number of protons in the atom.
Protons and neutrons form the nucleusof the atom with electons orbiting it
Atoms are arranged in molecular compounds in groups.
Electrons are arranged in shells, subshells and orbitals.