Which set of the electronic structures are only found in metals? A
2, 1
2, 8, 1
2, 8, 8, 1
B
2,5
2,6
2, 7
C 2,7
2,8,7
2, 8, 18, 7
D
2,8,3
2.8,4
2, 8, 5

A... According to the periodic table, elements with one electron at the outermost shell or orbital are classified as alkali METALS

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

the solar system used to have much dust particles option no d