div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imageimg data-url=documenthydrogen-light-blue-group-1-orange-group-2-yellow-green-light-green-groupshtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: · Hydrogen -- Light Blue Group 1 -- orange Group 2 -- yellow-green light green Groups 3-12 -- Blue - Yellow Group 13 - Red-orange Group 14 - - light brown Group 15 - Red Group loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader033fdocumentsinreader033viewer2022051921600e09c4308b1d73cf6f6b0chtml5thumbnails1jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=2Page 2button div class=trans-imageimg data-url=documenthydrogen-light-blue-group-1-orange-group-2-yellow-green-light-green-groupshtmlpage=2 data-page=2 class=trans-thumb lazyload alt=Page 2: · Hydrogen -- Light Blue Group 1 -- orange Group 2 -- yellow-green light green Groups 3-12 -- Blue - Yellow Group 13 - Red-orange Group 14 - - light brown Group 15 - Red Group loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader033fdocumentsinreader033viewer2022051921600e09c4308b1d73cf6f6b0chtml5thumbnails2jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=3Page 3button div class=trans-imageimg data-url=documenthydrogen-light-blue-group-1-orange-group-2-yellow-green-light-green-groupshtmlpage=3 data-page=3 class=trans-thumb lazyload alt=Page 3: · Hydrogen -- Light Blue Group 1 -- orange Group 2 -- yellow-green light green Groups 3-12 -- Blue - Yellow Group 13 - Red-orange Group 14 - - light brown Group 15 - Red Group loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII=...