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practice test
1. Which of the following particles represent the atomic number?
A) protons
B) electrons
C) neutrons
D) protons and electrons
2. Which of the following particles have the smallest mass?
A) electrons
B) protons
C) neutrons
D) ions
3. Hydrogen peroxide is chemically unstable; what are the products when it breaks down?
A) H2O
B) H2O + O
C) H2O + O2
D) O2
4. Which of the following is a halogen?
A) He
B) N2
C) O2
D) Br2
5. Some unique properties of H2O are attributed to its structure being ________.
A) linear
B) bent at 105
C) bent at 120
D) bent at 90
6. Atoms of Group VI elements require _______ additional electrons to complete the octet.
A) 2
B) 4
C) 6
D) 8
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