The first energy level of an atom is closest to the nucleus. True or false!?​

Which type of orbits are found in the principal energy level n = 2 a - s b - s, f c - s, d d - s, p e - s, p, d

As air becomes more dense, (select all that apply) o. air weighs less o. gas molecules are closer together o. air is colder o. air weighs more o. gas molecules are further apart o. air is hotter

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?