Beryllium's atomic mass is 9, and its atomic number is 4. How many protons are found in a beryllium atom?

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2

#7 how does the structure of amino acids allow them to form a polypeptide? each amino acid has an amino group and a carboxyl group. each amino acid has a hydrogen atom and a carboxyl group. each amino acid has a carboxyl group and an r group. each amino acid has an r group and a hydrogen atom.