Which list of symbols represents nonmetals, only? (1) b, al, ga (2) li, be, b (3) c, si, ge (4) p, s, cl

 The list  of symbols  that represents   non metal    is  P ,S , Cl (answer  4)

    Explanation

    Non metals   are   are  chemical  element  that   do   not have the characteristic   of the  metals.  for  example   ability to  conduct  electricity.

 List 4 elements that is P ( phosphorous),  S (sulfur)  and Cl (chlorine)  are non metals.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

the correct answer is:

a. formation of precipitation