Plz help! What is 1 item that is an element?

Give an example of how the 1 item is an element.

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

Me i dont know what to do! 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.