When writing an ionic compound formula, a "molecular" form is used. The formula is made with allowance for ion charges. For example, Ca²⁺ and NO₃⁻ ⇒ Ca(NO₃)₂ Al³⁺ and SO₄²⁻ ⇒ Al₂(SO₄)₃
Yuri Oganessian has already discovered the next noble gas at atomic weight 118, (which is 86 plus 32). The next most likely, if ever encountered, should be 150 (which is 118 plus 32) or at 168 (which is 118 plus 32 plus 16).
