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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.

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

Antoine Lavoisier

Dmitri Mendeleev

Henry Moseley

John Newlands

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

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

The atomic number increases from left to right, while the atomic mass increases from right to left.

The atomic mass increases from left to right, while the atomic number increases from right to left.

Both the atomic mass and the atomic number increase from left to right.

Both the atomic mass and the atomic number increase from right to left.

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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.

Answers:

Part 1:50

Part 2:50

Part 3:69

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Answer:

110

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Answer:

133

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