Chem Midterm 2

The number of electrons in a sodium ion, Na+, is A) 10. B) 11. C) 12. D) 23.

A) 10.

How many electrons are there in a phosphorus atom? A) 15 B) 19 C) 39 D) 84

A) 15

How many electrons are there in a sulfur atom? A) 16 B) 38 C) 47 D) 79

A) 16

An s sublevel can hold a maximum of A) 2 electrons. B) 6 electrons. C) 10 electrons. D) 14 electrons.

A) 2 electrons.

Which element is in the same period as carbon? A) B B) Ge C) Al D) P

A) B

Which element is a metal? A) Ca B) Br C) I D) Si

A) Ca

Which element is an alkaline earth? A) Ca B) Cl C) Ar D) K

A) Ca

Which element has the same number of valence electrons as potassium? A) Li B) As C) Al D) P

A) Li

All of the following species are isoelectric to Mg2+ except for A) Li+ B) Na+ C) Ne D) O2-

A) Li+

The element with the ground state electron configuration of 1s2 2s2 2p6 3s2 is A) Mg B) Ca C) Mn D) Ne

A) Mg

Mg2+ has the same electronic nature as A) Ne. B) Mg. C) C. D) Ar.

A) Ne.

In which group do all atoms have one valence electron in the ground state? A) alkali metals B) alkaline earths C) halogens D) noble gases

A) alkali metals

Which of the following is NOT characteristic of the line spectrum of an element? A line spectrum is A) continuous. B) discrete. C) unique. D) an energy profile.

A) continuous.

Elements in the same period generally have A) different properties. B) similar properties. C) similar number of neutrons. D) similar chemical symbols.

A) different properties.

As the energy level of an electron increases, the electron's distance from the nucleus, on average, A) increases. B) decreases. C) remains the same. D) cannot be predicted.

A) increases.

When magnesium reacts with chlorine, magnesium ions, Mg2+, and chloride ions, Cl-, are formed. In this reaction, magnesium atoms A) lose electrons. B) gain electrons; C) lose protons. D) gain protons.

A) lose electrons.

Which is the electron dot structure of nitrogen?

A) one on top, one on bottom, two on left, one on right

A horizontal row in the modern periodic table is called a A) period. B) group. C) branch. D) valence.

A) period.

The noble gases are inert. This means they A) undergo very few chemical reactions. B) exist as gases at room temperature. C) undergo many chemical reactions. D) lose and gain electrons easily.

A) undergo very few chemical reactions.

An electron-dot structure is a convenient method of representing A) valence electrons of an atom. B) core electrons of an atom. C) all electrons of the atom. D) the complete electron configuration of the atom.

A) valence electrons of an atom.

The number of protons in a sodium ion, Na+, is A) 10. B) 11. C) 12. D) 23.

B) 11.

How many electrons are there in a potassium atom? A) 15 B) 19 C) 39 D) 84

B) 19

What is the maximum number of electrons that can occupy a single p orbital? A) 1 B) 2 C) 6 D) 10

B) 2

The ground state electron configuration for sodium is A) 1s2 2s2 2p6 3s2 3p4. B) 1s2 2s2 2p6 3s1. C) 1s2 2s2 2p8. D) 1s2 2s2 2p6 3s2 3p6 4s1.

B) 2s2 2s2 2p6 3s1

What is the maximum number of electrons that can occupy the 2p sublevel? A) 2 B) 6 C) 8 D) 10

B) 6

Which element has the same number of valence electrons as phosphorus? A) Li B) As C) Al D) K

B) As

The element with the ground state electron configuration of 1s2 2s2 2p6 3s2 3p5 is A) F. B) Cl. C) Ar. D) Br.

B) Cl.

An element in the fourth period of the periodic table. A) C B) Cu C) Cs D) Cl

B) Cu

Which element is in the same group as carbon? A) B B) Ge C) Al D) P

B) Ge

How does the periodic table substantiate atomic theory? A) Both are theoretical and cannot support each other. B) Groups in the periodic table have similar properties based on similar features of atomic structure, namely, the same number of valence electrons per atom. C) All elements in a given period of the periodic table have the same number of valence electrons. D) Mendeleev declared consistency between the periodic table and atomic theory.

B) Groups in the periodic table have similar properties based on similar features of atomic structure, namely, the same number of valence electrons per atom.

Which element is a transition metal? A) Mg B) Hg C) Xe D) Br

B) Hg

Which of the following is NOT a characteristic of metals? A) Metals have a luster. B) Metals are gases at room temperature. C) Metals are good conductors of heat and electricity. D) Metals are solids at room temperature.

B) Metals are gases at room temperature.

Which element is classified as a metalloid? A) Li B) Si C) Cl D) Fe

B) Si

An element with electron structure 1s2 2s2 2p4 is in which group of the periodic table? A) II A B) IV A C) VI A D) VIII A

B) VI A

When an electron moves from the ground state to the excited state, it A) absorbs energy and moves closer to the nucleus. B) absorbs energy and moves farther from the nucleus. C) emits energy and moves closer to the nucleus. D) emits energy and moves farther from the nucleus.

B) absorbs energy and moves farther from the nucleus

In which group do all atoms have two valence electrons in the ground state? A) alkali metals B) alkaline earths C) halogens D) noble gases

B) alkaline earths

The number of electrons in a neutral atom is equal to the A) atomic mass. B) atomic number. C) atomic weight. D) line spectrum.

B) atomic number.

The designations s, p, d, f designate A) different electron energy levels, B) different electron orbitals within an energy level. C) different types of electrons. D) valence electrons.

B) different electron orbitals within an energy level.

The noble gases are a unique group of elements. They are recognized as unique due to the fact that they are A) all gases at room temperature. B) extremely stable and unreactive. C) the most reactive member of their period. D) named after Nobel prize winners.

B) extremely stable and unreactive.

When magnesium reacts with chlorine, magnesium ions, Mg2+, and chloride ions, Cl-, are fomred. In this reaction, chlorine atoms A) lose electrons. B) gain electrons C) lose protons. D) gain protons.

B) gain electrons.

A vertical column in the modern periodic table is called a A) period. B) group. C) branch. D) valence.

B) group

From the periodic table, the number of valence electrons for most of the main group elements may be determined directly from the

B) group number.

The specific pattern of colors emitted by excited atoms is called a A) rainbow. B) line spectrum. C) continuous spectrum. D) cathode ray.

B) line spectrum.

Which is the electron dot structure of oxygen?

B) one on top, one on bottom, two on left, two on right

Which is the electron dot structure of sulfur?

B) one on top, one on bottom, two on left, two on right

In the quantum mechanical view of the atom, electrons are confined to charge clouds called A) orbits. B) orbitals. C) energy levels. D) ions.

B) orbitals.

Elements in the same group generally have A) different properties. B) similar properties. C) similar number of neutrons. D) similar chemical symbols.

B) similar properties

Which is the electron dot structure for magnesium?

C) -Mg-

A d sublevel can hold a maximum of A) 2 electrons. B) 6 electrons. C) 10 electrons. D) 14 electrons.

C) 10 electrons.

The number of electrons in a sulfur ion, S2-, is A) 16. B) 14. C) 18. D) 32.

C) 18.

Which is an IMPOSSIBLE electron configuration? A) 1s2 2s2 B) 1s2 2s2 2p4 C) 1s3 2s2 2p4 D) 1s2 2s2 2p4 3s1

C) 1s3 2s2 2p4

The maximum number of electrons that may reside in the n=2 energy level is A) 2. B) 3. C) 8. D) 18.

C) 8.

Which element has the same number of valence electrons as boron? A) Li B) As C) Al D) P

C) Al

Which element is a noble gas? A) B B) Ge C) Ar D) K

C) Ar

The model for the atom which has electrons in fixed orbits was developed by A) Rutherford. B) Schrödinger. C) Bohr. D) Einstein.

C) Bohr

Which element is a transition metal? A) Li B) Ca C) Fe D) Br

C) Fe

Which is a result of the mathematically based quantum view of electrons in atoms? A) The position of every electron in an atom is precisely known. B) All electrons have the same position in atoms. C) The most probable position of each electron can be predicted. D) The position of electrons in atoms is not important.

C) The most probable position of each electron can be predicted.

Which of the halogens is a liquid at room temperature? A) fluorine B) chlorine C) bromine D) iodine

C) bromine

Noble gases are unreactive because of their electronic structures. The kind of reasoning that states "if other elements could be made to achieve noble gas electronic structures they would be more stable" is called __________. A) logic B) inductive reasoning C) deductive reasoning D) critical thinking

C) deductive reasoning

All noble gases have ________ valence electrons. A) three B) five C) seven D) eight

C) eight

A line spectrum is to an element as a(n) __________ is to a person A) brain B) eye C) fingerprint D) ear

C) fingerprint

In which group do all atoms have seven valence electrons in the ground state? A) alkali metals B) alkaline earths C) halogens D) noble gases

C) halogens

A metalloid A) is the same as a metal. B) is located on the left side of the periodic table. C) has properties intermediate between metals and nonmetals. D) is all of the above

C) has properties intermediate between metals and nonmetals.

Which element is a nonmetal? A) calcium B) iron C) iodine D) mercury

C) iodine

The lines in an atomic line emission spectrum are due to A) nuclear transitions in atoms. B) movement of electrons from lower energy states to higher energy states in atoms. C) movement of electrons from higher energy states to lower energy states in atoms. D) the presence of isotopes.

C) movement of electrons from higher energy states to lower energy states in atoms.

A sodium ion, Na+, has the same electron configuration as a(n) A) sodium atom. B) chlorine atom. C) neon atom. D) argon atom.

C) neon atom.

Which is the electron dot structure of calcium?

C) none on top or bottom, one on left, one on right

When an electron in an excited atom "falls down" to a lower energy level, the excited atom emits a characteristic A) electron. B) neutron. C) photon. D) proton.

C) photon.

Bromine has ______ valence electrons. A) three B) five C) seven D) eight

C) seven.

The line spectra of atoms provides evidence for A) the organization of particles in the nucleus of atoms. B) the number of protons. C) the arrangement of electrons. D) all of the above

C) the arrangement of electrons

The electrons in the outmost energy level of an atom are called A) group electrons. B) core electrons. C) valence electrons. D) orbital electrons.

C) valence electrons.

With respect to chemical bonding, which particles play the most active role? A) protons B) neutrons C) valence electrons D) core electrons

C) valene electrons

An f sublevel can hold a maximum of A) 2 electrons. B) 6 electrons. C) 10 electrons. D) 14 electrons.

D) 14 electrons.

The maximum number of electrons that may reside in the n=3 energy level is A) 2. B) 3. C) 8. D) 18.

D) 18.

Which orbital will have the lowest energy? A) 4d B) 4f C) 4p D) 4s

D) 4s

Which of the following pairs is isoelectric? A) Ar and Ne B) Ar and Na+ C) Ar and F- D) Ar and S2-

D) Ar and S2-

Which element is a halogen? A) Mg B) Hg C) Xe D) Br

D) Br

Which of the following molecules is NOT likely to exist? A) N2 B) F2 C) CCl4 D) He2

D) He2

Which molecule is NOT likely to exist? A) H2 B) Cl2 C) CH4 D) Ne2

D) Ne2

The nature of bonding force in a piece of matter influences which observable property of the matter? A) chemical reactivity B) state of the matter at room temperature C) strength and rigidity D) all of the above

D) all of the above

A chloride ion, Cl- has the same electron configuration as a(n) A) sodium atom. B) chlorine atom. C) neon atom. D) argon atom.

D) argon atom.

Carbon has ______ valence electrons A) one B) two C) three D) four

D) four

Which of the halogens is a solid at room temperature? A) fluorine B) chlorine C) bromine D) iodine

D) iodine

When atoms lose or gain electrons in chemical reactions they form A) new atoms. B) noble gases. C) nucleons. D) ions.

D) ions.

In which group do all atoms have eight valence electrons in the ground state? A) alkali metals B) alkaline earths C) halogens D) noble gases

D) noble gases

Elements in the same period have A) the same atomic number. B) the same number of neutrons. C) the same number of valence electrons. D) none of the above

D) none of the above

In attempting to explain the line spectrum of hydrogen, Bohr suggested that the energy of electrons in atoms is A) zero. B) infinite. C) continuous. D) quantized.

D) quantized.

Which element is a very good conductor of electricity? A) arsenic B) boron C) sulfur D) silver

D) silver

The inertness of the noble gases is due to A) the unique structure of their nuclei. B) the special number of protons and neutrons. C) the bonds they form with other elements D) the number and arrangement of their electrons.

D) the number and arrangement of their electrons.

Elements in the same group have A) the same atomic number. B) the same number of neutrons. C) the same number of electrons. D) the same number of valence electrons.

D) the same number of valence electrons.