First, pick from this list of elements: 0, C, N, Ca, H, P, K, S, Na, CI, Mg, Fe, Zn, SI, Sr, Br Write one paragraph about the discovery of the element you chose.
For some elements, the discovery was pre-historic, so you need to write about the first uses of the elem
For others, there is a story that was recorded.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 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.