There should be 3 valence electrons surrounding the aluminum ion
HISTORICAL INTRODUCTION.1<span> EVER since the establishment of the atomic theory by Dalton and Berzelius it was felt among chemists that there must be some relation between the atomic weights of the different elements and their properties. It was recognized very early that there exist groups of elements possessing related chemical and physical properties, and one of the earliest attempts to bring out this point is due to Dobereiner. In 1829 he tried to show that “many elements may be arranged in groups ()f three, in each of which the middle element has an atomic weight equal or approximately equal to the mean of the atomic weights of the two extremes.” As illustrations of this method of arrangement may be mentioned the following groups: Li, Na, K; Ca,Sr,</span>
Number 2. this is a chemical change cuz numbers 1, 3 and 4 are physical. So if you add the equation of 2 it has two molecules.
Some countries encourage it to maintain their population because people die and thats the truth, thats the first reason and second reason is because more population will boost their economy and business but some other country dont encourage it due to the reasons of chaos and crowds with many population.
Answer:
i think that it is C. both
Explanation:
