What is true of elements in a period on the periodic table?

Question

anonymous · Answer

They have similar properties.

       They have similar names.

       They have different properties that show no pattern.

       They have different properties that repeat across the next period.

anonymous · Answer

they are arrangeed as the atomic number increases
i gess but not sure

anonymous · Answer

he said period not colum

anonymous · Answer

It's A. Mendeleev arranged the periodic table by putting the elements in periods according to their properties and atomic masses. However, scientific discoveries have since then proven that elements should be arranged by atomic number.