Which of the following statements is true about the structure of an atom? 1. The proton and neutron are of equal mass.
2. The electron is the most massive subatomic particle.
3. The electron cloud contains more mass than the nucleus.
4. The nucleus of an atom contains more mass than the electron cloud.
A
1 and 4
O
2,3, and 4
O
1 only
2 and 3

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

An observation that requires measurement is called quantitative observable or qualitative

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal