Elements join together to form_.

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

The is a particle with one unit of positive charge a. proton b. positron c. electron d. nucleus awnser quick it is a important science test!