Atoms and molecules - One Line Questions

1. What is the atomic number of Hydrogen? — 1
2. What is the atomic number of Helium? — 2
3. How many atoms are in one molecule of Carbon Dioxide (CO2)? — 3
4. How many atoms are in one molecule of Ozone (O3)? — 3
5. What is the relative atomic mass of Hydrogen? — 1.008 amu
6. What is the relative atomic mass of Oxygen? — 15.999 amu
7. What is the relative atomic mass of Carbon? — 12.011 amu
8. What is the relative molecular mass of water (H2O)? — 18.015 amu
9. What is the relative molecular mass of Carbon Dioxide (CO2)? — 44.010 amu
10. What is the molar mass of water (H2O)? — 18.015 g/mol
11. What is the molar mass of Carbon Dioxide (CO2)? — 44.010 g/mol
12. The octet rule states that atoms tend to gain, lose, or share electrons to achieve a full outer shell of how many electrons? — 8
13. What is the electronic configuration of Sodium (Na) with atomic number 11? — 2, 8, 1
14. What is the electronic configuration of Chlorine (Cl) with atomic number 17? — 2, 8, 7
15. What is the atomic number of Carbon? — 6
16. What is Avogadro's number? — 6.022 x 10^23
17. What is a molecule? — Two or more atoms bonded together
18. A positively charged ion is called a: — Cation
19. Who is credited with the development of the atomic theory? — John Dalton
20. A negatively charged ion is called a(n): — Anion
21. What is the symbol for a chloride ion that has gained one electron? — Cl-
22. Rutherford's gold foil experiment led to the discovery of the: — Atomic Nucleus
23. Which subatomic particle has a positive charge? — Proton
24. The nucleus of an atom consists of: — Protons and Neutrons
25. What are valence electrons? — Electrons in the outermost shell
26. Which scientist proposed the 'plum pudding' model of the atom? — J.J. Thomson
27. Which element has the symbol 'Fe'? — Iron
28. What is the unit used to express the relative atomic mass of an element? — Atomic Mass Unit (amu)
29. Which of the following is an example of a triatomic molecule? — H2O
30. What is the symbol for a neutral atom of Helium? — He
31. Carbon-12 and Carbon-14 are examples of: — Isotopes
32. An atom that has gained or lost electrons is called a(n): — Ion
33. What is the term for atoms of the same element that have different numbers of neutrons? — Isotopes
34. The chemical formula for common salt is: — NaCl
35. The law stating that a chemical compound always contains the same elements in the same proportion by mass is: — Law of Definite Proportions
36. One mole of any substance contains Avogadro's number of particles. This is known as: — Avogadro's Law
37. Which law states that matter cannot be created or destroyed in a chemical reaction? — Law of Conservation of Mass
38. The number of protons in an atom's nucleus determines its: — Atomic Number
39. What is the basic unit of matter? — Atom
40. What is the symbol for a sodium ion that has lost one electron? — Na+
41. What is the charge of the nucleus of an atom? — Positive
42. The number of electrons in a neutral atom is equal to the number of: — Protons
43. What is the mass number of an atom? — Sum of protons and neutrons
44. Which of the following represents a molecule of water? — H2O
45. Which of the following is an example of a diatomic molecule? — N2
46. What is the chemical symbol for oxygen? — O
47. What is the charge of an electron? — Negative
48. Which element has the symbol 'K'? — Potassium
49. Which subatomic particle is found in the nucleus of an atom and has no charge? — Neutron
50. What is the chemical symbol for sodium? — Na
All One Line Questions
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