Which of the following is true about two unknown elements \(_{20}^{40}X\) and \(_{34}^{74}Y\) ?
https://pixabay.com/illustrations/periodic-system-chemistry-science-1059755/
They have the same number of valence electrons.
Their valence electrons are located in the same main energy level.
They tend to form the same ions to reach the electronic configuration of a noble gas.
They are both paramagnetic.
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