The entire universe originated from a single point. what events happened within the first few seconds of this event?

One second after the Big Bang, the universe was filled with neutrons, protons, electrons, anti-electrons, photons and neutrinos.  During the first three minutes of the universe, the light elements were born during a process known as Big Bang nucleosynthesis.

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halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).