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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom5 Marks
Question
An atom of element $E$ contains $3$ protons, $3$ electrons and $4$ neutrons:
  1. What is its atomic number$?$
  2. What is its mass number$?$
  3. Write the electronic configuration of the element $E.$
  4. State whether element $E$ is a metal or non-metal. Why$?$
  5. What type of ion, cation or anion, will be formed by an atom of element $E?$ Why$?$
  6. Write the symbol of the ion formed by an atom of element $E.$
  7. What could element $X$ be$?$
✓

Answer

  1. Its atomic number is $3$
  2. Mass no. $= 3 + 4 = 7$
  3. Electronic configuration is
$\text{K}\ \ \ \ \ \text{L}\\2\ \ \ \ \ \ 1$
  1. Element $E$ is a metal because in order to complete its octet, the element loses $1$ electron from its outermost orbit and attains a stable configuration with $2$ electrons in its first shell. Elements which lose electrons to attain stability are called metals.
  2. $A$ Cation will be formed by an atom of element $A$ because its outermost single electron can be easily donated.
  3. $E^+$
  4. Element $X$ is lithium.

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