Name all the period 2 elements in mendeleevs periodic table

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Explain that newton first law, second law and third law of motion?

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?