Question 9 — Find the following information for - Questions at the end of the chapter - Chapter 8 - Journey Inside the Atom (Exploration)

Last updated at July 3, 2026 by

Question 9
Find the following information for the elements shown in Fig. 8.17: (i) Name of the element (ii) Symbol (iii) Total number of electrons (iv) Number of valence electrons (v) Valency of the element (vi) Number of protons (vii) Atomic number
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  • Count the electrons in the shell diagram → that equals the total electrons , the protons and the atomic number (neutral atom).
  • Electrons in the outermost shell = valence electrons .
  • Valency = electrons needed to reach an octet (or lost if fewer than 4 in the outer shell).
  • Match the atomic number to Table 8.4 to read the name and symbol .

Read each diagram: total electrons → Z → name & symbol; outer electrons → valence electrons & valency.

Reading a Shell Diagram Count electrons equals atomic number Protons equal electrons (neutral atom) Outer electrons are valence electrons Valency from the octet rule
Back to: 8.8 Combining Capacity of an Atom: Valency
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