Be sure to answer all parts. assume the diameter of a neutral helium atom is 1.40 × 102 pm. suppose that we could line up helium atoms side by side in contact with one another. how many atoms would it take to make the distance 2.60 cm from end to end? × 10 he atoms (enter your answer in scientific notation.)

Match each vocabulary term to its definition. 1. electrons neutral subatomic particles found in the nucleus of the atom 2. neutron lowest energy position of an electron in an atom 3. photon the path of an electron around the nucleus of an atom 4. ground state negatively charged, subatomic particles 5. protons packet of energy of specific size 6. element substance with only one type of atom 7. orbital positively charged, subatomic particles found in the nucleus of the atom