Download App

Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom5 Marks
Question
The atom of an element $X$ has $7$ electrons in its $M$ shell:
  1. Write the electronic configuration of element $X.$
  2. What is the atomic number of element $X?$
  3. Is it a metal or a non-metal$?$
  4. What type of ion will be formed by an atom of element $X?$ Write the symbol of the ion formed.
  5. What could element $X$ be$?$
✓

Answer

  1. Electronic configuration of the element $X$ is,
Element X: $\text{K}\ \ \ \ \ \ \text{L}\ \ \ \ \ \ \text{M}\\2\ \ \ \ \ \ \ 8\ \ \ \ \ \ \ 7$
  1. Atomic number of the element $X$ will be $17$
  2. Element $X$ is a non-metal because there are $7$ electrons in its outermost orbit. In order to complete its octet (to get $8$ electrons), it will gain one electron. An element which gains electrons in order to complete its octet is a non-metal.
  3. The element will form an anion by gaining an extra electron in order to complete its octet. Symbol of an ion of $X$ will be $X^-$
  4. $X$ is Chlorine.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Que-Ans (Each of 5 Mark )" from Structure of the Atom→Structure of the Atom — all question types→Science STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

State and explain the law of conservation of energy with an example.
→
What do you mean by passive and active transport? Write a note on diffusion.
→
Give the fsour characteristics of algae.
→
Grass looks green, papaya appears yellow. Which cell organelle is responsible for this?
→
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not?
→
Write a note on kingdom Fungi.
→
Write a short note on prevention of animal diseases.
→
Discuss the various methods which are used to control plant diseases.
→
Iron filings and sulphur were mixed together and divided into two parts, $A$ and $B$. Part $A$ was heated strongly while part $B$ was not heated. Dilute hydrochloric acid was added to both the parts and evolution of gas was seen in both the cases. How will you identify the gases evolved?
→
For increasing production, What is common in poultry, fisheries and bee-keeping$?$
→