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NEET UG Classification of Elements — practice questions — page 3

Explore 108 free Classification of Elements questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Classification of Elements questions and exercises with answers

Showing questions 61–90 of 108.

Why are alkali and alkaline earth metals never found free in nature?Read the answer and worked solution →The s-block and p-block elements together are called what?Read the answer and worked solution →Group 16 elements are commonly known by which family name?Read the answer and worked solution →Zn, Cd and Hg lack most transition element properties because their configuration is what?Read the answer and worked solution →The d-block elements occupy which groups?Read the answer and worked solution →Which series of elements runs from cerium (Z = 58) to lutetium (Z = 71)?Read the answer and worked solution →The actinoid series extends from thorium to which element?Read the answer and worked solution →Why are early actinoids chemically more complex than lanthanoids?Read the answer and worked solution →Silicon, germanium, arsenic and antimony are classed as what type of elements?Read the answer and worked solution →Which two non-metals are exceptions in having high melting and boiling points?Read the answer and worked solution →What is the increasing order of metallic character for Si, Be, Mg, Na and P?Read the answer and worked solution →Within a period, chemical reactivity is highest in group 1 and rises again to a maximum in which group?Read the answer and worked solution →How does reactivity change on moving down the halogen group?Read the answer and worked solution →The Cl-Cl bond length in Cl2 is 198 pm. What is the covalent radius of chlorine?Read the answer and worked solution →Adjacent copper atoms in solid copper are 256 pm apart. What is copper's metallic radius?Read the answer and worked solution →Roughly how large is the radius of a typical atom?Read the answer and worked solution →Why does atomic radius generally decrease across a period?Read the answer and worked solution →The atomic radius of fluorine is 64 pm. What is the radius of the fluoride ion?Read the answer and worked solution →Sodium has an atomic radius of 186 pm. Which value is the radius of Na+?Read the answer and worked solution →How many electrons does each of O2-, F-, Na+ and Mg2+ contain?Read the answer and worked solution →Among the isoelectronic ions O2-, F-, Na+ and Mg2+, which is the smallest?Read the answer and worked solution →Among Mg, Mg2+, Al and Al3+, which species is the largest?Read the answer and worked solution →Ionization enthalpy is the energy needed to remove an electron from an atom in which state?Read the answer and worked solution →Why is second ionization enthalpy above the first?Read the answer and worked solution →On a plot of first ionization enthalpy against atomic number, the maxima occur at which elements?Read the answer and worked solution →Why is oxygen's first ionization enthalpy below nitrogen's?Read the answer and worked solution →Na, Mg and Si have first ionization enthalpies 496, 737 and 786 kJ/mol. Al's value is closest to what?Read the answer and worked solution →Why do halogens have highly negative electron gain enthalpies?Read the answer and worked solution →An electron added to a noble gas atom must enter what?Read the answer and worked solution →Why is fluorine's electron gain enthalpy less negative than chlorine's?Read the answer and worked solution →

Worked practice questions

Why are alkali and alkaline earth metals never found free in nature?

  1. They sublime easily
  2. They are too dense
  3. They are highly reactive
  4. They are radioactive
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Correct answer: C. They are highly reactive

Their low ionization enthalpies make s-block metals so reactive that they always occur combined in compounds.

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The s-block and p-block elements together are called what?

  1. Representative elements
  2. Transition elements
  3. Rare earth elements
  4. Inner transition elements
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Correct answer: A. Representative elements

s- and p-block elements are grouped as the representative or main group elements.

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Group 16 elements are commonly known by which family name?

  1. Noble gases
  2. Halogens
  3. Pnictogens
  4. Chalcogens
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Correct answer: D. Chalcogens

The oxygen family of group 16 is called the chalcogens, while group 17 is the halogens.

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