Regents Chemistry Test Preparation Practice Periodic Table

The elements on the Periodic Table of the Elements are arranged in order of increasing*

(1) atomic number

(2) mass number

(3) number of neutrons

(4) number of valence electrons

The elements on the Periodic Table of the Elements are arranged in order of increasing*

(1) atomic mass

(2) formula mass

(3) atomic number

(4) oxidation number

On the Periodic Table, the number of protons in an atom of an element is indicated by its*

(1) atomic mass

(2) atomic number

(3) selected oxidation states

(4) number of valence electrons

The arrangement of the elements from left to right in Period 4 on the Periodic Table is based on*

(1) atomic mass

(2) atomic number

(3) the number of electron shells

(4) the number of oxidation states

The elements in Period 4 on the Periodic Table are arranged in order of increasing*

(1) atomic radius

(2) atomic number

(3) number of valence electrons

(4) number of occupied shells of electrons

The elements on the Periodic Table are arranged in order of increasing*

(1) mass number

(2) atomic number

(3) number of isotopes

(4) number of valence electrons

All elements on the modern Periodic Table are arranged in order of increasing*

(1) atomic mass

(2) molar mass

(3) number of neutrons per atom

(4) number of protons per atom

The elements on the Periodic Table are arranged in order of increasing*

(1) atomic mass

(2) atomic number

(3) molar mass

(4) oxidation number

What is the total number of neutrons in an atom of K-42?*

(1) 19

(2) 20

(3) 23

(4) 42

Compared to an atom of C-12, an atom of C-14 has a greater*

(1) number of electrons

(2) number of protons

(3) atomic number

(4) mass number

Which two notations represent isotopes of the same element?*

(1) ¹⁴₇N and ¹⁸₇N

(2) ²⁰₇N and ²⁰₁₀Ne

(3) ¹⁴₇N and ¹⁷₁₀Ne

(4) ¹⁹₇N and ¹⁶₁₀Ne

Base your answers to questions 12 on the information below and on your knowledge of chemistry.

In the late 1800s, Dmitri Mendeleev developed a periodic table of the elements known at that time. Based on the pattern in his periodic table, he was able to predict properties of some elements that had not yet been discovered. Information about two of these elements is shown in the table below.

states-of-matter fig: chem62018-exam_g25.png

Identify the element that Mendeleev called eka-silicon, Es.*

Base your answers to questions 13 on the information below and on your knowledge of chemistry.

Many scientists made observations of the elements that led to the modern Periodic Table. In 1829, Dobereiner found groups of three elements that have similar properties and called each of these groups a triad. Dobereiner noticed a relationship between the atomic masses of the elements in each triad. Triad 1, shown in the table below, consists of sulfur, selenium, and tellurium. The middle element, selenium, has an atomic mass that is close to the sum of the atomic masses of sulfur and tellurium, divided by 2.

The other triads shown in the table below demonstrate the same mathematical relationship.

elements-in-the-periodic-table fig: chem82017-exam_g17.png

Show a numerical setup that demonstrates Dobereiner’s mathematical relationship for triad 2.*

Base your answers to questions 14 on the information below and on your knowledge of chemistry.

Before atomic numbers were known, Mendeleev developed a classification system for the 63 elements known in 1872, using oxide formulas and atomic masses. He used an R in the oxide formulas to represent any element in each group. The atomic mass was listed in parentheses after the symbol of each element. A modified version of Mendeleev’s classification system is shown in the table below.

elements-in-the-periodic-table fig: chem62013-exam_g16.png

Identify one characteristic used by Mendeleev to develop his classification system of the elements.*

Base your answers to questions 15 on the information below and on your knowledge of chemistry.

The four naturally occurring isotopes of sulfur are S-32, S-33, S-34, and S-36. The table below shows the atomic mass and percent natural abundance for these isotopes.

identification-of-element fig: chem12020-exam_g9.png

State both the number of protons and the number of neutrons in an S-33 atom.*