Group the elements into pairs that would most likely exhibit similar chemical properties. it does not matter which pair of elements is pair 1, pair 2, or pair 3, so long as the correct elements are paired. na, o, ne, se, rb, kr

Pair 1 : Na & Rb

Pair 2 : O & Se

Pair 3 :  Ne & Kr

Explanation:

Pair  1 are Group 1 elements in the periodic table. They are electro-positive elements that exhibit metallic properties.

Pair 2 are Group 6 elements in the periodic table. They are electro-negative elements that exhibit non-metallic properties.

Pair 3 are Group 8 or Group 0 elements in the periodic table. They are mainly inert gases.

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- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."