How many protons, neutrons, and electrons are there in 21 [3] 41 (5) protons=33. protons=42. protons=75. protons=45. protons=33. neutrons42. neutrons=44 neutrons=75. neutrons=75. neutrons=42, electrons=33 electrons-30 electrons=34 electrons=30 electrons=36

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