Using the Periodic Table of the Elements, the properties of elements can often be used to deduce the properties of neighboring elements. In which set can the reactivity of the first three elements be used to most accurately predict the reactivity of the fourth element?

oxygen (O), sulfur (S), tellurium (Te) → selenium (Se)

silver (Ag), sodium (Na), strontium (Sr) → sulfur (S)

fluorine (F), oxygen (O), nitrogen (N) → carbon (C)

antimony (Sb), tellurium (Te), iodine (I) → xenon (Xe)

The Periodic Table of the Elements is useful for revealing patterns and trends in the elements. Which statement accurately describes a pattern in the size of atomic radii in the Periodic Table of the Elements?

Atomic radii decrease from left to right across a period and increase from top to bottom in a group.

Atomic radii decrease from left to right across a period and decrease from top to bottom in a group.

Atomic radii increase from left to right across a period and increase from top to bottom in a group.

Atomic radii increase from left to right across a period and decrease from top to bottom in a group.

The size of atoms can be measured using the diffraction of x-rays. Measurements of atomic size confirm that trends can be identified based on location on the Periodic Table of the Elements. Which group of elements is listed in order of decreasing size?

boron, carbon, nitrogen, oxygen

iodine, bromine, chlorine, fluorine

phosphorous, selenium, iodine, radon

sodium, potassium, rubidium, cesium

Elements found on the periodic table are arranged by atomic number and show a periodic pattern of physical and chemical properties. Which is an accurate example of one of these periodic patterns when reading the table from left to right and top to bottom?

The number of valence electrons decreases from the end of one period to the beginning of the next.

The number of valence electrons increases as the atomic number decreases.

The number of protons in the nucleus decreases as the atomic number increases.

The number of protons in the nucleus decreases from the end of one period to the beginning of the next.

A sample of matter is classified as an electrical conductor. The sample is most likely

a nonmetal with tightly bound electrons.

a nonmetal with free electrons.

a metal with tightly bound electrons.

The element krypton is a gas that shows almost no chemical activity. To find another element with similar properties, what should a student look for on the Periodic Table of the Elements?

an element with the same net charge

an element with the same atomic mass

The periodic table has changed over time as new elements have been added to it. Which is the most likely reason scientists update the periodic table?

Scientists discover new elements.

Stars produce new elements that travel to Earth.

Past mistakes are corrected in identifying

The top row of the Periodic Table of the Elements has only two elements. Which of the following best explains why this row contains fewer elements than the other rows?

The innermost electron orbital holds only two electrons.

Only noble gases are located on the top row

The top row contains the two lightest elements.

Electrons in orbitals tend to be together in pairs.

Periodic Table

Chemistry

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of these elements has the greatest atomic radius?

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What has to occur before an atom in its ground state can emit a photon?

reversal of the spin of an electron

ionization of an electron from the atom

relaxation of an electron to a lower energy state

excitation of an electron to a higher energy state

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Going from left to right in the periodic table, the atomic radius decreases. Which of the following explains the atomic radii trend of elements across a period?

There is an increase in the number of electron shells.

There is a decrease in the number of electron shells.

The attraction increases between the nucleus and the outer electrons.

The attraction decreases between the nucleus and the outer electrons.

Electronegativity is a measure of how easy it is for an atom to attract another electron. The elements He, Ne, and Ar have the lowest electronegativity values. What do these elements have in common?

They have an outer orbital full of electrons.

They have one electron in their outer orbital.

They lose a proton which makes them negatively charged.

They have an extra electron which makes them positively charged.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The ionization potential of an element is the amount of energy required to remove an electron from an isolated atom or molecule. According to the periodic table, which of the following indicates the correct decreasing order of ionization potential?

Li>Na>K>Cs

Na>K>Li>Cs

Li>K>Na>Cs

Cs>K>Na>Li

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The elements chromium (Cr) and zinc (Zn) are in period four of the periodic table. Which characteristic of zinc and chromium is correct based on their positions?

Zinc has a greater atomic radius than chromium.

Zinc loses electrons more easily than chromium.

Chromium has more valence electrons than zinc.

Chromium has lower ionization energy than zinc.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Electron affinity increases from bottom to top in a family of nonmetal elements on the periodic table. What other pattern occurs from bottom to top of a nonmetal family based on this change in electron affinity?

increase of the atomic number

increase of chemical reactivity

decrease of activation energy

decrease of ionization energy

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Periodic Table

Which of these elements has the greatest atomic radius?

What has to occur before an atom in its ground state can emit a photon?

Going from left to right in the periodic table, the atomic radius decreases. Which of the following explains the atomic radii trend of elements across a period?

Electronegativity is a measure of how easy it is for an atom to attract another electron. The elements He, Ne, and Ar have the lowest electronegativity values. What do these elements have in common?

The ionization potential of an element is the amount of energy required to remove an electron from an isolated atom or molecule. According to the periodic table, which of the following indicates the correct decreasing order of ionization potential?

The elements chromium (Cr) and zinc (Zn) are in period four of the periodic table. Which characteristic of zinc and chromium is correct based on their positions?

Electron affinity increases from bottom to top in a family of nonmetal elements on the periodic table. What other pattern occurs from bottom to top of a nonmetal family based on this change in electron affinity?

Using the Periodic Table of the Elements, the properties of elements can often be used to deduce the properties of neighboring elements. In which set can the reactivity of the first three elements be used to most accurately predict the reactivity of the fourth element?

The Periodic Table of the Elements is useful for revealing patterns and trends in the elements. Which statement accurately describes a pattern in the size of atomic radii in the Periodic Table of the Elements?

Fluorine, chlorine, bromine, and iodine all have the same number of valence electrons and have a tendency to gain electrons. Which element has the greatest tendency to gain electrons?

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