what did henry moseley determine that contributed to understanding the
atom?
a. that each element has a different number of isotopes.
b. that each element has a different number of protons.
c. that each element has a different number of neutrons.
d. that each element has a different number of electrons.

the correct answer is B) that each element has a different of protons

Explanation:

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

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