An element from group 2 on the periodic table will bond ionically with elements from group 17 (7A).

a) Choose an element from each of these groups and write the chemical formula for the compound they create.

b) Explain how the ionic bond is created between these two elements.

The answer to your question is below

Explanation:

a) I will choose three elements of each group

   Group IIA              Group VIIA            Formula

        Mg         +                F                       MgF₂            

        Ca          +                Cl                      CaCl₂

        Sr           +                 Br                      SrBr₂

b) Elements in group IIA have 2 electrons in their outermost shell so they can donate these electrons of group VII A which have seven electrons in their outermost shell. So it is necessary 2 elements of group VII A, each atoms accepts one electron.

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.