*ONE MULTIPLE CHOICE* *10 POINTS*

how many shells are in the Bohr model of the sodium atom in the ground state?

Which of the following elements is a representative element? a. chromium (cr) b. aluminum (al) c. mercury (hg) d. silver (ag)

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 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.

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?