How many protons can a nucleus hold

Stable nuclei with atomic numbers up to about 20 have an neutron:proton ratio of about 1:1 (solid line). Figure 1: permission from Wikipedia. The deviation from the N:Z=1 line on the belt of stability originates from a non-unity N:Z ratio necessary for total stability of nuclei

hope this helps you:)

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