Is limestone a mixture or a pure substance

3. if the dartboard below is used to model an atom, which subatomic particles would be located at z?

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Light waves travel than sound waves.