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Question 18 In 1898, the gases neon and krypton were discovered by British chemists Sir William Ramsay and Morris W. Travers, who were studying the composition of Earth's atmospheric gases. Neon and krypton are not reactive. The best reasoning for this observation is that neon and krypton- have the maximum number of electrons in their outermost shells. are gases at room temperature. tend to donate electrons to other atoms easily. are NOT readily available in Earth's atmosphere.

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A. have the maximum number of electrons in their outermost shells.

Explanation

Neon and krypton are both noble gases, which are known for their low reactivity. The low reactivity of noble gases is due to their electron configurations. They have a full valence shell, meaning they have the maximum number of electrons in their outermost shells. This full valence shell is a stable configuration, and atoms with such a configuration do not readily react with other substances. The fact that they are gases at room temperature is a physical property and does not directly relate to their reactivity. The tendency to donate electrons to other atoms easily would make them reactive, which is the opposite of what is observed for neon and krypton. Lastly, the availability of these gases in Earth's atmosphere is not the reason for their low reactivity; it is a result of their stability and non-reactivity.

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