Elements on the periodic table are arranged into vertical columns called groups. Which of the following is true of the elements in a group? O All the elements in a group have the same mass.
Elements in a group have the same number of neutrons.
Elements in a group have similar properties.
O Elements in a group have the same number of protons.

One of the hopes for solving the world's energy problem is to make use of the fusion reaction 21h +31h --> 42he + 10n + energy how much energy is released when 1 mol of deuterium is fused with 1 mol of tritium according to the above reaction? the masses of the atoms and the neutrons are as follows: 21h = 2.0140 amu 31h = 3.01605 amu 42he = 4.002603 amu 10n = 1.008665 amu. the speed of light is 2.9979 x 108 m/s.

Calculate the frequency of a wave in a spring toy. the wave has a speed of 1.1 meters per second and a wavelength of 0.1 meters. *

Why is it incorrect to balance a chemical equation by changing the subscripts? explain.