Quantum Models of Atoms: Quantum Numbers and Atomic Orbitals
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Questions and Answers

How is the Modern Periodic Table different from Mendeleev's Periodic Table?

  • It is based on atomic number instead of atomic mass. (correct)
  • It arranges elements based on the number of electron orbits.
  • It uses roman numerals and alphabets to classify elements.
  • It groups elements based on their reactivity with water.

What is the significance of atomic number in the Periodic Table?

  • It represents the number of electron shells in an atom.
  • It indicates the number of protons in the nucleus of an atom. (correct)
  • It reflects the reactivity of elements with oxygen.
  • It determines the valency of elements in a group.

Which group in the Periodic Table consists of elements with limited reactivity?

  • Group 8A - Noble Gases (correct)
  • Group 1A - Alkali Metals
  • Group 7A - Halogens
  • Group 2A - Alkaline Earth Metals

What do the Group 1A elements in the Periodic Table react with oxygen to form?

<p>Metallic oxides that are basic (A)</p> Signup and view all the answers

Which group of elements in the Periodic Table is known for compounds that are insoluble in water?

<p>Group 2A - Alkaline Earth Metals (B)</p> Signup and view all the answers

What does the term 'halogen' in Group 7A of the Periodic Table refer to?

<p>'Salt-producing' (C)</p> Signup and view all the answers

How are the representative or main group elements classified in the Periodic Table?

<p>In the longer columns labeled A Group (B)</p> Signup and view all the answers

'Inner Transition Elements' in the Periodic Table are located where?

<p><em>In the two long rows at the lower section of the table</em> (C)</p> Signup and view all the answers

Which scientist is credited with the discovery of the concept of atomic number?

<p>Not mentioned in the text (D)</p> Signup and view all the answers

What was the basis of Mendeleev's Periodic Table?

<p>Atomic mass (D)</p> Signup and view all the answers

In Mendeleev's Periodic Table, how were elements arranged as they moved across the table?

<p>Increasing atomic mass (A)</p> Signup and view all the answers

What does the Modern Periodic Table use as the basis for element arrangement?

<p>Atomic number (A)</p> Signup and view all the answers

What term describes the number of electron shells (orbits) in an atom of an element?

<p>Period (B)</p> Signup and view all the answers

Which group of elements in the Periodic Table are known for compounds that are basic when dissolved in water?

<p>Alkali Metals (Group 1A) (B)</p> Signup and view all the answers

Which group of elements in the Periodic Table is referred to by the Greek word 'hal-' meaning 'salt' and '-gen' meaning 'to produce'?

<p>Halogens (Group 7A) (B)</p> Signup and view all the answers

'Representative or Main Group Elements' in the Periodic Table are classified under which longer columns?

<p>(The A Group) Main Group Elements (D)</p> Signup and view all the answers

'Inner Transition Elements' in the Periodic Table are located where?

<p>(Inner Transition Elements) (D)</p> Signup and view all the answers

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