Quiz 5.1 Organizing the Elements

Is the following sentence true or false? The first elements to be identified were mainly gases.

• True

• False

Answer explanation

The statement is false because the first elements identified in the universe were primarily solid and liquid materials, not mainly gases. Gases were among the later elements formed.

As the number of known elements grew, so did the need to organize them into groups based on their __________.

• properties

• colors

• sizes

• weights

Answer explanation

As the number of known elements increased, organizing them by their properties became essential for understanding their behavior and relationships, making 'properties' the correct choice over colors, sizes, or weights.

Select the letters of each category that the French chemist Antoine Lavoisier used to classify elements.

• gases

• metals

• liquids

• nonmetals

Answer explanation

Antoine Lavoisier classified elements into categories such as gases, metals, and nonmetals. He did not classify elements as liquids, making gases, metals, and nonmetals the correct choices.

Is the following sentence true or false? Mendeleev needed to organize information about 63 elements.

• True

• False

Answer explanation

The statement is true because Mendeleev organized information about 63 known elements to create the periodic table, which helped to classify and understand their properties.

Mendeleev’s strategy for classifying elements was modeled on a(n) __________.

• game of cards

• chessboard

• puzzle

• domino set

Answer explanation

Mendeleev’s classification of elements was akin to a game of cards, where he organized elements based on their properties and atomic weights, similar to how cards are grouped and played in various combinations.

Select the letters of each type of information Mendeleev knew about each element.

• name

• number of protons

• relative mass

• properties

Answer explanation

Mendeleev knew the name, relative mass, and properties of elements. He did not have knowledge of the number of protons, as this concept was developed later with the discovery of atomic structure.

Mendeleev arranged the elements into rows in order of __________ so that elements with similar properties were in the same column.

• increasing atomic mass

• decreasing atomic number

• alphabetical order

• random order

Answer explanation

Mendeleev arranged the elements in order of increasing atomic mass, which allowed him to group elements with similar properties in the same columns, forming the basis of the periodic table.

Is the following sentence true or false? A periodic table is an arrangement of elements in columns, based on a set of properties that repeat from row to row.

• True

• False

Answer explanation

The statement is true because a periodic table organizes elements in columns and rows based on recurring properties, such as atomic number and chemical behavior, which repeat across the table.

Mendeleev published the table above in 1872. Why did Mendeleev leave some locations in his periodic table blank?

• He ran out of elements to include.

• He predicted the existence of undiscovered elements.

• He wanted to create a more visually appealing table.

• He made a mistake in his calculations.

Answer explanation

Mendeleev left some locations blank because he predicted the existence of undiscovered elements. This foresight allowed him to maintain the table's organization and accommodate future discoveries.

Tags

NGSS.HS-PS1-1

Select the letters of two elements that have similar properties.

• zinc (Zn)

• chlorine (Cl)

• nitrogen (N)

• bromine (Br)

Answer explanation

Chlorine (Cl) and bromine (Br) are both halogens in Group 17 of the periodic table, sharing similar chemical properties such as reactivity and forming similar compounds. Zinc (Zn) and nitrogen (N) belong to different groups.