Magnesium consists of three naturally occurring isotopes. Mg-24 (atomic mass 23.80) has a relative abundance of 78.70%, Mg-25 (atomic mass 24.99) has a relative abundance of 10.13%, and Mg-26 (atomic mass 25.98) has a relative abundance of 11.7%. Calculate the average atomic mass of the three isotopes.

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)

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

idk i’m struggling too