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Chemistry Concepts Quiz
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Chemistry Concepts Quiz
📚 Part 1: Multiple Choice (Pick the best answer)
1. What is the best definition of matter?
Anything that has mass and takes up space
A form of energy
Only solids and liquids
2. The atomic number of an element equals the number of:
Protons
Neutrons
Electrons and neutrons combined
3. Which element from the list is a nonmetal?
Magnesium
Oxygen
Sodium
4. For a neutral atom, which statement is true?
# of protons = # of neutrons
# of protons = # of electrons
# of electrons = atomic mass
5. Carbon-14 is an isotope of carbon. How many neutrons does carbon-14 have? (Atomic number of C = 6)
6
8
14
6. Which element has the highest electronegativity?
Sodium (Na)
Fluorine (F)
Potassium (K)
7. An ionic bond is most likely to form between:
Two nonmetals
A metal and a nonmetal
Two noble gases
8. Main-group elements in Group 1A (the alkali metals) have how many valence electrons?
1
2
8
✏️ Part 2: Short Answer & Calculations
9. An atom has an atomic number of 28 and an atomic mass of 61. Calculate the number of protons, neutrons, and electrons. Show your work.
10. Explain briefly why isotopes of the same element have the same chemical behavior but different masses.
11. Write the number of electrons in a neutral sodium atom and then in a Na+ ion.
12. For the following pair, calculate neutrons: Carbon-12 and Carbon-14. Show number of protons and neutrons for each.
13. Name the ionic compound formed by sodium and chlorine (write the proper name).
14. Magnesium commonly forms a Mg2+ ion. How many electrons does Mg2+ have? (Atomic number Mg = 12)
15. Describe the octet rule in one sentence and give one short example (element and how it achieves an octet).
16. Briefly explain the difference between atomic number and atomic mass.
🧩 Part 3: Matching (Draw lines to match)
17. Proton
18. Neutron
19. Electron
20. Isotope
A. Neutral particle in nucleus (no charge)
B. Subatomic particle with negative charge that orbits the nucleus
C. Atoms of the same element with different numbers of neutrons
D. Positively charged particle in nucleus that defines atomic number
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