Someone please help with my chemistry.

1) it is not possible. The only things that can change is the number of electrons and the neutrons making isotopes ...

2) neon is a stable element so it cannot change its neutrons..

3)Yes sodium is not a stable element so it can change it's valence electrons..

Explanation:

Hope this helped you..Have a nice day

1.)In an oxygen atom,there are 8 protons and 8 electrons.Most oxygen atoms also have 8 neutrons,but it is possible for an oxygen atom to have 9 or 10 neutrons.They are just rarer.The oxygen we breathe is not atomic form.

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

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