Why and how are elements arranged in the 4th period? Why does the size of an atom not decrease regularly in a period? Give the trend of ionization energy in a period.
Added by Jared R.
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Elements are arranged in the 4th period based on their atomic number, which increases from left to right. The 4th period consists of 18 elements, starting with potassium (K, atomic number 19) and ending with krypton (Kr, atomic number 36). The arrangement of Show more…
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