Question 1

If X can represent the chemical symbol of any element in the periodic table,then   represents an isotope of

Accepted Answer

A) calcium. 
B) uranium. 
C) niobium. 
D) lead. 
A) calcium. 
B) uranium. 
C) niobium. 
D) lead.

Question 2

Write the electron configuration for potassium.

Accepted Answer

Potassium (K) is the 19th element on the

Question 3

The mass of a nucleon is approximately four times the mass of a hydrogen atom.

Accepted Answer

A) True 
 B)False

Question 4

The neutron has

Accepted Answer

A) the same approximate mass and charge as an electron. 
B) the same approximate mass and charge as a proton. 
C) the same approximate mass as a proton, but no charge. 
D) the same approximate mass as an electron, but no charge. 
A) the same approximate mass and charge as an electron. 
B) the same approximate mass and charge as a proton. 
C) the same approximate mass as a proton, but no charge. 
D) the same approximate mass as an electron, but no charge.

Question 5

The noble gases are a unique group of elements.They are recognized as unique due to the fact that they are

Accepted Answer

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. 
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.

Question 6

The nuclear model of the atom was constructed from which fundamental experiment?

Accepted Answer

A) alpha particle scattering by thin metal foils 
B) cathode ray behavior in electrical fields 
C) atomic spectra from gas discharge tubes 
D) electrolysis of water 
A) alpha particle scattering by thin metal foils 
B) cathode ray behavior in electrical fields 
C) atomic spectra from gas discharge tubes 
D) electrolysis of water

Question 7

Alkali metals have an ns ² outer electron structure.

Accepted Answer

A) True 
 B)False

Question 8

With the discovery of isotopes,which postulate of Dalton's original atomic theory must be modified?

Accepted Answer

A) Matter is made up of atoms. 
B) Atoms combine with other atoms in whole number ratios to form compounds. 
C) All atoms of the same element are the same. 
D) In chemical reactions, the arrangement of atoms is changed. 
A) Matter is made up of atoms. 
B) Atoms combine with other atoms in whole number ratios to form compounds. 
C) All atoms of the same element are the same. 
D) In chemical reactions, the arrangement of atoms is changed.

Question 9

Elements in the same period generally have

Accepted Answer

A) different properties. 
B) similar properties. 
C) similar number of neutrons. 
D) similar chemical symbols. 
A) different properties. 
B) similar properties. 
C) similar number of neutrons. 
D) similar chemical symbols.

Question 10

Tritium is the common name for

Accepted Answer

A) hydrogen-0. 
B) hydrogen-1. 
C) hydrogen-2. 
D) hydrogen-3. 
A) hydrogen-0. 
B) hydrogen-1. 
C) hydrogen-2. 
D) hydrogen-3.

Question 11

An anion is a

Accepted Answer

A) negatively charged ion. 
B) positively charged ion. 
C) negative electrode. 
D) positive electrode. 
A) negatively charged ion. 
B) positively charged ion. 
C) negative electrode. 
D) positive electrode.

Question 12

Which element is a nonmetal?

Accepted Answer

A) calcium 
B) magnesium 
C) chlorine 
D) chromium 
A) calcium 
B) magnesium 
C) chlorine 
D) chromium

Question 13

Which element has the same number of valence electrons as boron?

Accepted Answer

A) Na 
B) Si 
C) Ga 
D) F 
A) Na 
B) Si 
C) Ga 
D) F

Question 14

Which is a result of the mathematically based quantum view of electrons in atoms?

Accepted Answer

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. 
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.

Question 15

A cathode is a

Accepted Answer

A) negatively charged ion. 
B) positively charged ion. 
C) negative electrode. 
D) positive electrode. 
A) negatively charged ion. 
B) positively charged ion. 
C) negative electrode. 
D) positive electrode.

Question 16

Which element is in the fourth period of the periodic table?

Accepted Answer

A) N 
B) Ni 
C) Cd 
D) Si 
A) N 
B) Ni 
C) Cd 
D) Si

Question 17

How does the periodic table substantiate atomic theory?

Accepted Answer

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. 
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.

Question 18

Which is an IMPOSSIBLE electron configuration?

Accepted Answer

A) 1s² 2s² 
B) 1s² 2s² 2p4 
C) 1s³ 2s² 2p5 
D) 1s² 2s² 2p⁶ 3s² 
A) 1s² 2s² 
B) 1s² 2s² 2p4 
C) 1s³ 2s² 2p5 
D) 1s² 2s² 2p⁶ 3s²

Question 19

The electrons in the outermost energy level of an atom are called

Accepted Answer

A) group electrons. 
B) core electrons. 
C) valence electrons. 
D) orbital electrons. 
A) group electrons. 
B) core electrons. 
C) valence electrons. 
D) orbital electrons.

Question 20

How many electrons are there in a argon atom?

Accepted Answer

A) 36 
B) 18 
C) 40 
D) 24 
A) 36 
B) 18 
C) 40 
D) 24

Exam 3: Atomic Structure

If X can represent the chemical symbol of any element in the periodic table,then represents an isotope of

Write the electron configuration for potassium.

The mass of a nucleon is approximately four times the mass of a hydrogen atom.

The neutron has

The noble gases are a unique group of elements.They are recognized as unique due to the fact that they are

The nuclear model of the atom was constructed from which fundamental experiment?

Alkali metals have an ns ² outer electron structure.

With the discovery of isotopes,which postulate of Dalton's original atomic theory must be modified?

Elements in the same period generally have

Tritium is the common name for

An anion is a

Which element is a nonmetal?

Which element has the same number of valence electrons as boron?

Which is a result of the mathematically based quantum view of electrons in atoms?

A cathode is a

Which element is in the fourth period of the periodic table?

How does the periodic table substantiate atomic theory?

Which is an IMPOSSIBLE electron configuration?

The electrons in the outermost energy level of an atom are called

How many electrons are there in a argon atom?

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