Struktur atom dan hukum periodik unsurCukup sering
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W, X, Y and Z are short-period main-group elements with increasing atomic numbers. The number of outermost electrons of W is twice the number of electrons in its next-to-outermost shell; the L shell of X holds three times as many electrons as its K shell; the number of outermost electrons of Y equals its number of electron shells; Z is in the same main group as X. Which statement is correct? ( ).
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