Periodic Table

Question 1

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.

Revolt · Accepted Answer

Mendeleev produced the first orderly arrangement of known elements.; Mendeleev used patterns to predict undiscovered elements.

Question 2

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

Revolt · Accepted Answer

Part 1: 3; Part 2: 13

Question 3

neutrons protons ✔ valence electrons

Revolt · Accepted Answer

valence electrons

Question 4

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.

Revolt · Accepted Answer

Part 1: 50; Part 2: 50; Part 3: 69

Question 5

⇒ 110

Revolt · Accepted Answer

71992

Question 6

⇒ 133

Revolt · Accepted Answer

71996

Question 7

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

Revolt · Accepted Answer

Henry Moseley

Question 8

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

Revolt · Accepted Answer

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

Question 9

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

Revolt · Accepted Answer

The elements of the periodic table fall into three general categories metals, nonmetals, and metalloids.

Question 10

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

Revolt · Accepted Answer

metals; nonmetals; metalloids

Periodic Table Answers

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