While along a group they stay the same, the valence electrons rise over a time.
The tiniest and least massive component of an atom is an electron, which has a negative charge. In a neutral atom, the number of protons and electrons is equal. For instance, the hydrogen atom only contains one proton and one electron. While the uranium atom has 92 protons and, thus, 92 electrons.
The atom's negatively charged particles are called electrons. An atom's whole population of electrons generates a negative charge that counteracts the positive charge of the protons in the atomic nucleus.
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