1. Scientists before Mendeleev had observed that certain elements reacted similarly with other chemicals. Which further observation led Mendeleev to create the periodic table?
A The elements within these groups often differed
physical properties, such as color and texture
B. The atomic weights of the elements within these groups were spaced at nearly regular increments
C The reactivity of the elements within these groups varied at nearty regular increments
D. Elements that did not fit in these groups belonged in the lanthanide and actinide series
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B The atomic weights of the elements within these groups were spaced at nearly regular increments

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

hurricanes form in warm water