What do the green-colored blocks indicate? A halogens B. alkali metals C alkaline metals D. noble gases

## Step 1: Identify the elements highlighted in green<br />### The elements highlighted in green are Hydrogen (H), Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr).<br /><br />## Step 2: Determine the group of these elements<br />### These elements belong to Group 1 of the periodic table, which is known as the alkali metals.<br /><br />## Step 3: Match the group with the given options<br />### Among the provided options, "alkali metals" correctly identifies the group of elements highlighted in green.