Identify whether each element is a halogen, a noble gas, or nonmetal only. Astatine (At):

Nitrogen (N):

Krypton (Kr):

Chlorine (Cl):

Sulfur (S)

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %

Suppose you discovered a new element with 120 protons and 2 electrons in its outer level . i'm what group does this new element belong? what properties would you expect it to have

How can the number of core electrons be determined from the periodic table