Chemistry
Periodic Classification and Elements
1,092 Questions
Periodic classification organizes chemical elements based on atomic structure, periodic laws, and elemental properties. It covers historical classification systems, electron configurations, and periodic trends. Test takers preparing for chemistry sections will find these questions crucial for mastering fundamental element properties and atomic interactions.
Periodic table structureAtomic orbitalsElement identificationPeriodic laws
Periodic Classification and Elements Questions
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The number of shells in an atom of an element
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The number of electrons in outer shell of an atom of an element
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The number of protons and neutrons in the nucleus of an atom
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The number of neutrons in the nucleus of an atom
A
Correct answer
Explanation
The number of shells in an atom determines its period in periodic table. If an element has one shell, it is kept in first period and so on.
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2, 7
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2, 8, 7
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2, 8, 18, 7
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2, 8, 18, 18, 7
C
Correct answer
Explanation
It is the electronic configuration of bromine.
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The number of electrons in outer orbit of an atom
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The number of electrons in inner orbit of an atom
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The number of electrons, which an atom can donate, accept or share
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The number of shells present in an atom
C
Correct answer
Explanation
The valency of an atom is equal to the number of electrons, which an atom can donate, accept or share to attain the configuraton of inert elements.
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systematic study of elements
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prediction of new elements
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correction of atomic masses
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position of isotopes
D
Correct answer
Explanation
The periodic table by Mendeleev could not explain the position of isotopes. It is because it is based upon the atomic masses of elements.
C
Correct answer
Explanation
Helium is a chemical element, which are generally neuter in German, taking das.
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Calcium (Ca), Helium (He)
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Copper (Cu), Gold (Au)
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Lithium (Li), Beryllium (Be)
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Aluminum (Al), Zinc (Zn)
B
Correct answer
Explanation
Elements in the same group (column) of the periodic table share similar chemical properties. Copper and gold are both transition metals in group 11.
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Alkali metals
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Metalloids
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Halogens
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Noble gases
D
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Explanation
Noble gases (Group 18) are characterized by being colorless, odorless, and monatomic gases at room temperature.
D
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Explanation
Uranium, with an atomic number of 92, is the heaviest element found in significant quantities in nature. Elements beyond this are typically synthetic.
A
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Explanation
The periodic table is arranged into 7 horizontal rows, which are called periods.
A
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Explanation
Horizontal rows in the periodic table are defined as periods, while vertical columns are defined as groups.
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Noble gases
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Alkali Metals
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Halogens
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Transition metals
C
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Explanation
The term 'halogen' comes from Greek words meaning 'salt-former', as these elements readily react with alkali metals to form salts.
A
Correct answer
Explanation
Groups are the vertical columns in the periodic table, where elements share similar valence electron configurations.
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Gases
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Metalloids
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Metals
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Nonmetals
C
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Explanation
The vast majority of elements on the periodic table are metals, occupying the left and center sections of the table.
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Alphabetically
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Based on physical and chemical properties
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Increasing number of electrons
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Most reactive to least reactive
B
Correct answer
Explanation
Elements are arranged in the periodic table based on their atomic number and their recurring physical and chemical properties.
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Helium (He)
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Hydrogen (H)
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Lead (Pb)
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Radon (Rn)
C
Correct answer
Explanation
Stars fuse elements through nuclear fusion, but this process generally stops at iron. Lead is the heaviest stable element produced through various stellar nucleosynthesis processes, such as the s-process in AGB stars.