Which of these groups of elements all have 7 valence electrons? a) Transition Medals
b) Noble Gasses
c) Alkali Medals
d) Halogens

There are main groups in the modern periodic table of elements

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.

Why do lunar and solar eclipse not happen every month