The atomic number of lithium is 3. how many neutrons does an atom of lithium have if it is represented by the symbol shown below? 7li

Can someone me with questions 15 to 17 plz.

If two objects at different te,peraure are in contact with each other what happens to their temperature

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 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.