How many valence electrons does li have?

It has a single valence electron.

3pro & 3ele - it is the single electron in shell 2.

Li has 1 valence electron

Homogeneous mixture    

a) Soda Water  

b)Milk        

c) Air          

Heterogeneous mixture

d) Soil

e) Blood                                        

c) Air

Explanation:

Mixture:

mixture is made up of different atoms and can be separated into its component by physical mean.

•The properties of the mixture are not same and contains the properties of all those component present in it.

•mixture is a combination of one or more Pure substances and can be separated by simple physical methods.

•it have varying boiling and melting point.

There are two types of mixture

Homogeneous mixture and heterogeneous mixture

Homogeneous mixture:

It have same uniform appearance and the different components cannot be distinguished by naked eye.

Heterogeneous mixture:

It do not have uniform appearance and the different components of the mixture can be distinguished and observed by naked eye.

Classification of the given mixtures

      Homogeneous mixture                          Heterogeneous mixture

           a) Soda Water                                                   d) Soil

           b)Milk                                                                 e) Blood                                        

           c) Air