Go Pro
Exam guides
UPSC CSEBankingSSCRailwayState PSCDefence
Study material
FlashcardsFormula sheetsEssay topicsAbbreviationsImportant daysImportant eventsPrevious year papersDownloads
Log in Sign up

Home › Chemistry › Atomic Structure

Atomic Structure — Chemistry Questions & Practice

Practise 144 Atomic Structure questions from Chemistry for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.

Practise this topic

144 questions · 0 quizzes · free to start

Practice questions on Atomic Structure — with answers

Try each question first, then open the answer. Explanations are included.

1. An atom of Helium (He) has an atomic number of 2. How many protons does it contain?

  1. A1
  2. B6
  3. C2
  4. D4
Show answer

Answer: C

The atomic number equals the number of protons. Helium has atomic number 2, so it has 2 protons.

2. An atom of Lithium (Li) has an atomic number of 3 and an atomic mass number of approximately 7. How many neutrons does it contain?

  1. A7
  2. B0
  3. C3
  4. D4
Show answer

Answer: D

Number of neutrons = Mass number - Atomic number = 7 - 3 = 4.

3. An atom of Beryllium (Be) has an atomic number of 4. How many protons does it contain?

  1. A6
  2. B4
  3. C8
  4. D5
Show answer

Answer: B

The atomic number equals the number of protons. Beryllium has atomic number 4, so it has 4 protons.

4. A neutral atom of Beryllium (Be) has an atomic number of 4. How many electrons does it contain?

  1. A6
  2. B3
  3. C4
  4. D2
Show answer

Answer: C

In a neutral atom, the number of electrons equals the number of protons (atomic number). Beryllium has 4 electrons.

5. An atom of Beryllium (Be) has an atomic number of 4 and an atomic mass number of approximately 9. How many neutrons does it contain?

  1. A7
  2. B5
  3. C1
  4. D9
Show answer

Answer: B

Number of neutrons = Mass number - Atomic number = 9 - 4 = 5.

Practise more Atomic Structure questions

More Chemistry topics

Molarity and Concentration (1105)Mole Concept (990)Gas Laws - Boyle's Law (492)Gas Laws - Charles's Law (490)Normality and Equivalent Weight (344)Stoichiometry (336)Specific Heat Calculations (288)Density Calculations (187)Gas Laws - Ideal Gas Equation (160)pH and pOH Calculations (127)Periodic Table - Atomic Numbers (72)Periodic Table - Element Symbols (72)Common Compounds - Names and Formulas (57)Alloys (20)Acids, Bases and Salts (17)Percentage Composition (16)Periodic Table - General Facts (15)Metals and Non-metals (14)All Chemistry →