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Questions and Answers
Which of the following is a noble gas?
Which of the following is a noble gas?
- Nitrogen
- Helium (correct)
- Hydrogen
- Oxygen
Which of the following is a characteristic of an acid?
Which of the following is a characteristic of an acid?
- Tastes bitter
- Reacts with metals to produce hydrogen gas
- Turns blue litmus paper red (correct)
- Has a pH above 7
What is the atomic number of carbon?
What is the atomic number of carbon?
- 12
- 6 (correct)
- 5
- 8
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Study Notes
Elements and Compounds
- Noble gases are a group of elements that are chemically inert and do not easily react with other elements.
- The noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
Acids
- A characteristic of an acid is that it donates a proton (H+ ion) or accepts an electron pair in a chemical reaction.
Atomic Structure
- The atomic number of an element is the number of protons present in the nucleus of an atom, which determines the identity of the element.
- The atomic number of carbon is 6.
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