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Chemical Milestones and Constants

Chemistry

A collection of questions focusing on the numerical, historical, and naming conventions of chemistry.

history science facts

12 Questions Medium Ages 14+ Sep 27, 2026

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About this Study Set

This study set covers Chemistry through 12 practice questions. A collection of questions focusing on the numerical, historical, and naming conventions of chemistry. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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Browse all 12 questions from the Chemical Milestones and Constants study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 In what year did Dmitri Mendeleev publish his first version of the Periodic Table of Elements?

A 1869
B 1875
C 1882
D 1890

2 How many elements are currently officially recognized on the IUPAC Periodic Table?

A 108
B 118
C 128
D 138

3 What is the approximate value of Avogadro's constant, representing the number of particles in one mole?

A 6.022 × 10^21
B 6.022 × 10^22
C 6.022 × 10^23
D 6.022 × 10^24

4 Who is credited with the discovery of the element Oxygen in 1774?

A Antoine Lavoisier
B Joseph Priestley
C John Dalton
D Robert Boyle

5 What is the atomic number of the element Gold?

A 47
B 79
C 82
D 92

6 Marie Curie was awarded her first Nobel Prize in Physics in which year?

A 1901
B 1903
C 1905
D 1911

7 Standard atmospheric pressure at sea level is defined as how many kilopascals (kPa)?

A 95.2 kPa
B 101.3 kPa
C 105.5 kPa
D 110.1 kPa

8 How many valence electrons does a neutral atom of Carbon have in its ground state?

9 What is the pH value of pure water at a temperature of 25 degrees Celsius?

A 5.0
B 6.0
C 7.0
D 8.0

10 The isotope Carbon-14 is commonly used for radiocarbon dating; how many neutrons does it possess?

A 6
B 8
C 10
D 14

11 Which scientist proposed the 'Plum Pudding' model of the atom in 1904?

A J.J. Thomson
B Ernest Rutherford
C Niels Bohr
D James Chadwick

12 What is the maximum number of electrons that can occupy the second electron shell (n=2) of an atom?

A 2
B 8
C 18
D 32

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