Elements present in second group of periodic table?
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➡️The rows are called PERIODS and the columns are called GROUPS. Hydrogen (H) is the first element in the periodic table because it has just one proton in its nucleus. Helium (He) is second, because it has two protons, and so on.
➡️The rows are called PERIODS and the columns are called GROUPS. Hydrogen (H) is the first element in the periodic table because it has just one proton in its nucleus. Helium (He) is second, because it has two protons, and so on.
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