Question

who is credited with creating the first periodic table?
johann dobereiner
henry moseley
dmitri mendeleev
john newlands

Explanation:

Johann Dobereiner created triads of elements, Henry Moseley refined the periodic table by atomic number, John Newlands proposed the law of octaves, but Dmitri Mendeleev is widely credited with developing the first widely accepted, organized periodic table that included gaps for undiscovered elements and predicted their properties.

Answer:

Dmitri Mendeleev