Flag of the Element Zirconium

Flag of the Element Yttrium

Flag of the Element Strontium

Flag of Rubidium

Flag for the Element of Krypton

Flag for the Element of Bromine

Flag of the Element of Arsenic & Selenium

Arsenic is the 33rd element, in the third period so it gets a full center of yellow since yellow is associated with 3.  The red and blue stripes along the top and bottom reflect the numbers 15, and this is the group this element belongs to. The blue central disc with symbol for Arsenic is reflective of the letter P flag, as this element is on the P-Block

Selenium is the 34th element so it gets a yellow and green field reflective of the numbers 3 and 4 for 34.