For no. 1: Bases and Acids are opposite from each other. An acid is any chemical substance that when it dissolves in water, it creates a solution with a hydrogen ion activity greater than water. Any substance with a pH less than 7.0 is an acid, and includes, for example, sauerkraut or pickles.
A base is any chemical substance dissolves in water, creates a solution where hydrogen ion activity less than water. Any substance with a pH greater than 7.0 is a base, and includes, for example, bleach or ammonia.
1. Your answer isn't correct. Two examples would be: strontium, magnesium.
2. This is correct! Well done! :)