Please help with these two.

In the nucleus of an atom, there are 20 protons and 21 neutrons. What are the atomic number and mass number of this isotope?


Study the electron dot diagrams. Which two elements are most likely to react and form a compound? What type of compound are they likely to form?

Here's the Link for the second one.

https://lh6.googleusercontent.com/mSQgXYC4apZ8dSozKwd4NEXSFAjIc_c2T9BTN5G3jCmg-KCWgTXUNKjfZqPSatbBxLS5xCwY5Q=w596