4. which of the following materials is necessary to stop a beta particle? (1 point)
three feet of concrete
three inches of lead
thin pieces of wood
single sheet of paper
5. a neutron breaks down to form (1 point)
an alpha particle
two protons
a proton and an electron
a helium nucleus
6. what does the band of stability for atomic nuclei refer to? (1 point)
the ratio of protons to neutrons
the ratio of neutrons to protons
the ratio of beta particles to neutrinos
the ratio of alpha particles to beta particles

At room temperature what happens to the average kinetic energy of the molecules of a solid, liquid, and a gas

According to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? view available hint(s) according to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? trigonal bipyramidal tetrahedral square planar determination of electron geometry requires information on whether the electron groups are lone pairs or bonding groups.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?