Introduction to atoms) How do I do this

50 pts plz what is the physical state of matter of baking soda.

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.

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?