qual dos elementos a seguir pode formar 3 ligaçoes covalentes com outro atomo dele mesmo? 1argonio 2 iodo 3calcio 4nitrogenio 5sodio

How to solve 4 nh3(g) + 5 o2(g) > 4 no(g) + 6 h2o(g) in chemistry

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Can someone me with these questions plz.