Question

list these elements in order of decreasing electronegativity. sr, be, ca, mg → __, , , __

Explanation:

Step1: Recall electronegativity trend

Electronegativity decreases down a group in the periodic table. Be (beryllium), Mg (magnesium), Ca (calcium), and Sr (strontium) are all in Group 2.

Step2: Order elements

Based on the trend, the order of decreasing electronegativity is Be > Mg > Ca > Sr.

Answer:

Be, Mg, Ca, Sr