Periodic Table Answers

Which statements accurately describe Dmitri Mendeleev’s contributions to the development of the periodic table? Check all that apply.Mendeleev wrote the first modern chemistry textbook.Mendeleev produced the first orderly arrangement of known elements.Mendeleev ordered the elements by increasing atomic number.Mendeleev used patterns to predict undiscovered elements.Mendeleev accounted for variations resulting from isotopes.

Which scientist arranged the elements in order of increasing atomic number, rather than increasing atomic mass?

The element aluminum (Al) is outlined in red on the periodic table. Which period number is aluminum? Which group number is aluminum in?

Which statement accurately compares the trends in atomic number and atomic mass in the periodic table?

neutrons protons ✔ valence electrons

How many protons are in an atom of tin? How many electrons are in an atom of tin? How many neutrons are in an atom of tin? Round your answer to the nearest whole number.

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Name the three general categories into which the elements are divided.

What did you include in your response? Check all that apply.