Structure of atoms, molecules, bonds - Question Bank

1. What is the most common element in Earth's crust?
A) Iron
B) Silicon
C) Oxygen
D) Aluminum
2. The molecule H2SO4 is known as:
A) Hydrochloric acid
B) Sulfuric acid
C) Nitric acid
D) Acetic acid
3. What is the primary difference between an atom and an ion?
A) Number of neutrons
B) Number of protons
C) Electrical charge
D) Atomic mass
4. Which of the following is NOT a type of chemical bond?
A) Ionic bond
B) Covalent bond
C) Hydrogen bond
D) Gravitational bond
5. What is the atomic number of Carbon?
A) 4
B) 5
C) 6
D) 7
6. The octet rule states that atoms tend to achieve how many electrons in their outermost shell for stability?
A) Two
B) Four
C) Six
D) Eight
7. What is the chemical symbol for sodium?
A) S
B) So
C) Na
D) Sn
8. Which type of bond is typically found in metals?
A) Ionic bond
B) Covalent bond
C) Metallic bond
D) Hydrogen bond
9. When an atom loses an electron, it becomes:
A) An anion with a negative charge
B) A cation with a positive charge
C) A neutral ion
D) An isotope
10. What force holds the nucleus of an atom together?
A) Electromagnetic force
B) Weak nuclear force
C) Strong nuclear force
D) Gravitational force
11. Which of the following is a compound?
A) O2
B) N2
C) CO2
D) He
12. What is a molecule composed of atoms of only one element called?
A) Compound
B) Element
C) Isotope
D) Polymer
13. The number of protons in an atom's nucleus is equal to its:
A) Mass number
B) Atomic mass
C) Atomic number
D) Number of neutrons
14. What is the charge of a neutron?
A) +1
B) -1
C) 0
D) Variable
15. Which element is in Group 1 (alkali metals) of the periodic table?
A) Calcium
B) Potassium
C) Magnesium
D) Aluminum
16. What is the process by which an atom or molecule loses electrons?
A) Reduction
B) Ionization
C) Oxidation
D) Neutralization
17. What is the process by which an atom or molecule gains electrons?
A) Oxidation
B) Reduction
C) Ionization
D) Dissociation
18. Which of the following is a diatomic molecule?
A) Ozone (O3)
B) Methane (CH4)
C) Nitrogen (N2)
D) Carbon Dioxide (CO2)
19. What is the atomic number of Helium?
A) 1
B) 2
C) 3
D) 4
20. A chemical reaction in which electrons are transferred from one species to another is called a(n):
A) Acid-base reaction
B) Precipitation reaction
C) Redox reaction
D) Combustion reaction
21. What type of bond is responsible for holding the two strands of a DNA molecule together?
A) Covalent bonds
B) Ionic bonds
C) Hydrogen bonds
D) Metallic bonds
22. Which of the following has the highest electronegativity?
A) Carbon
B) Nitrogen
C) Oxygen
D) Fluorine
23. What is a double covalent bond?
A) Sharing of two electrons between two atoms
B) Sharing of four electrons between two atoms
C) Transfer of two electrons between two atoms
D) Sharing of one electron between two atoms
24. Which element has the chemical symbol 'Fe'?
A) Fluorine
B) Iron
C) Gold
D) Silver
25. Atoms tend to gain, lose, or share electrons to achieve a stable electron configuration, often resembling that of:
A) Alkali metals
B) Halogens
C) Noble gases
D) Transition metals
26. What is the valence shell of an atom?
A) The innermost electron shell
B) The outermost electron shell
C) The nucleus of the atom
D) The shell containing the most electrons
27. The attraction between oppositely charged ions is called an:
A) Covalent bond
B) Metallic bond
C) Ionic bond
D) Hydrogen bond
28. What is the primary type of bond found in a diamond crystal (a form of carbon)?
A) Ionic bond
B) Metallic bond
C) Hydrogen bond
D) Covalent bond
29. Which of the following is a noble gas?
A) Fluorine
B) Neon
C) Sodium
D) Chlorine
30. What is the term for the energy required to remove an electron from an atom?
A) Electron affinity
B) Ionization energy
C) Electronegativity
D) Bond energy
31. The mass number of an atom is the sum of the number of protons and:
A) Electrons
B) Neutrons
C) Isotopes
D) Ions
32. Which element has the atomic number 6?
A) Nitrogen
B) Carbon
C) Boron
D) Silicon
33. What is the chemical formula for water?
A) HO2
B) H2O
C) O2H
D) OH
34. What is the atomic symbol for oxygen?
A) O2
B) Ox
C) O
D) Og
35. What is the most abundant element in the universe?
A) Oxygen
B) Carbon
C) Helium
D) Hydrogen
36. Which of the following is an example of a molecule?
A) Na+
B) Cl-
C) H2O
D) Mg
37. A nonpolar covalent bond occurs when electrons are shared:
A) Unequally between atoms
B) Completely transferred from one atom to another
C) Equally between atoms
D) Between charged particles
38. A polar covalent bond occurs when electrons are shared:
A) Equally between atoms
B) Unequally between atoms
C) Completely transferred from one atom to another
D) Between ions
39. The bond formed between two nonmetals is typically:
A) Ionic
B) Metallic
C) Covalent
D) Van der Waals
40. The bond formed between a metal and a nonmetal is typically:
A) Covalent
B) Ionic
C) Metallic
D) Hydrogen
41. What is an anion?
A) A positively charged ion
B) A neutral atom
C) A negatively charged ion
D) An atom with no neutrons
42. What is a cation?
A) A negatively charged ion
B) A positively charged ion
C) A neutral atom
D) A molecule with an odd number of electrons
43. An atom that gains or loses electrons becomes an ion, which carries an electrical charge. True or False?
A) True
B) False
C) Depends on the element
D) Only if it gains electrons
44. What is the primary force that holds atoms together in a chemical bond?
A) Gravitational force
B) Electromagnetic force
C) Strong nuclear force
D) Weak nuclear force
45. In a covalent bond, atoms:
A) Share electrons
B) Lose electrons
C) Gain electrons
D) Exchange ions
46. Which type of bond involves the transfer of electrons from one atom to another?
A) Covalent bond
B) Ionic bond
C) Polar covalent bond
D) Nonpolar covalent bond
47. A molecule is formed when two or more atoms are joined by what type of bond?
A) Ionic bond
B) Covalent bond
C) Metallic bond
D) Hydrogen bond
48. What term describes atoms of the same element with different numbers of neutrons?
A) Isomers
B) Ions
C) Isotopes
D) Allotropes
49. The atomic number of an element is determined by the number of:
A) Neutrons
B) Electrons
C) Protons
D) Isotopes
50. Which subatomic particle has no electrical charge?
A) Electron
B) Proton
C) Neutron
D) Positron
All Question Banks
E-Book Structure of atoms, molecules, bonds One Line Questions Structure of atoms, molecules, bonds Online Test Structure of atoms, molecules, bonds