Apart of the periodic table is shown. a portion of the first two columns of the periodic table is shown. column one from top to bottom reads 11 sodium, 19 potassium, and 37 rubidium. column two reads 12 magnesium, 20 calcium, and 38 strontium. which of the following elements is more reactive than the others? calcium (ca) magnesium (mg) potassium (k) sodium (na)

K

Explanation:

The reactivity of metals is described by its size. Since metals tend to lose their outer shell electrons in reactions to become positively charged ions, the lower the attraction force between a nucleus and valence electrons, the easier it is to lose those electrons for a metal and become an ion. The greater the size, the lower the Coulombic force between a nucleus and valence electrons

Atomic size increase from right to left across the period and down the group. This implies that potassium has a highest radius and, therefore, is the most reactive.