1. When scandium donates three electrons from the outer state orbitals then it forms Sc3+ and its electron configuration is equal to the electron configuration of Argon which is a noble gas. Hence scandium forms a tri positive ion with a noble gas structure
2. the effective nuclear change of an atom increases as the number of protons in an atom increases. Therefore as we go from left to right on the periodic table, the effective nuclear charge of an atom increases in strength and holds the outer electrons closer and tighter to the nucleus
3. Atomic number and atomic weight
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