atoms space made of 3 species of subatomic particles; electrons, protons and also neutronsatomic number is the number of protons. Atomic number is characteristic for the element. In soil state atoms, the variety of electrons and also protons room the same. The digital configuration of Ca in the ground state is Ca - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²when Ca loses its 2 valence electrons, it becomes positively charged and also the digital configuration becomesCa - 1s² 2s² 2p⁶ 3s² 3p⁶number of electrons in Ca²⁺ is 18the atom in the ground state would have actually the same number of electrons and also protons. Therefore variety of protons space 18. Climate the atomic variety of the aspect is 18the atom having actually an atomic number of 18 is Ar.the price is 1) Ar

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