You need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. First, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. If they meet these criteria, they will have similar properties.
The first pair: Ne (Neon) and Kr (Krypton), are noble gases found in group 8
The second pair: Li (Lithium) and K (Potassium), found in group 1
The third pair: S (Sulfur) and Te (Tellurium), found in group 6
i believe the answer is...
Atoms of isotopes of an element have different numbers of protons.
Open system is a system in which mass or energy can be lost to or gained from the environment. In this case, water and power come from external sources best explains why a washing machine would be considered an open system.
Answer:
It causes light to slow down significantly
Explanation:
The index of refraction of a substance describes the speed of light in that substance, as a ratio of the speed of light in vacuum to its speed in that substance.
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