An electron in a helium atom transitions from a 2p orbital to a ls orbital. The difference in energy between the two states is 3.40 x 10-18 J.
Which of the following best describes how the energy of the helium atom is affected by the electronic
transition?

The continuous release of nuclear energy caused when one fission reaction triggered more nuclear reactions is a

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true