Usually (ignoring transition metals, as they kinda get trickier), the element's valency can be found out by its group (column) number. Usually, we ignore the transition metal block while counting these columns, so Aluminium is in group 3, for example. Since Aluminium is in group 3, it has 3 valence electrons.
Answer:
Potassium (K) and Lithium (Li) for the fist one i cant see the second
Explanation:
Electromagnetic energy would be your answer :)
Answer:
Single Replacement Reaction
Explanation:
simply because only 1 element switched places.
