Which of the following would not have the same number of valence electrons as the others?
boron
aluminum
gallium
selenium

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?