which size would be best as a poster above a desk?

That will depend on the specifics. If you are looking to utilize this chart as reference in a bedroom environment, then going with either the 15 x 20 or 18 x 24 option is a good choice depending on the wall space available. If this is for a classroom environment then maybe going with the larger 24 x30 chart is the better option.

Are the semimetals featured as being blue or black? (Just asking cause the pictures show two different things)

The Semimetals are blue as in the primary image. The Images showing black must be a faulty render output. Thanks for bringing this to our attention.

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Young N Refined Periodic table science poster LAMINATED new 2023 chart teaching elements classroom BLACK decoration premium educators atomic number guide 15x20

Young N Refined Periodic table science poster LAMINATED new 2023 chart teaching elements classroom BLACK decoration premium educators atomic number guide 15x20

Product ID: 72684203

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📏Compact 15x20 inch size

🧪Laminated 3 mil plastic finish

🛡️Water & tear resistant durability

Description

🧬 Elevate your space with the ultimate periodic table poster—where science meets style!

BUILT TO LAST - Water and tear resistant design keeps your poster pristine through years of classroom use.
INSTANT SCIENCE VIBES - Sleek black background with multicolor elements adds a modern, premium touch to any learning environment.
CRYSTAL CLEAR LEARNING - Glossy laminated finish ensures vibrant colors and easy readability from across the room.
EDUCATOR APPROVED DESIGN - Created with teachers in mind for maximum educational impact and effortless student engagement.
PERFECT FIT FOR ANY SPACE - Compact 15x20 inches ideal for classrooms, bedrooms, or study nooks without overwhelming your decor.

This 2023 Young N Refined laminated periodic table poster features a durable 3 mil plastic finish that is water and tear resistant, designed specifically for educators and students. Measuring 15x20 inches, it offers a clear, vibrant, and easy-to-read layout with a sleek black background and multicolor elements, perfect for classrooms, bedrooms, or study areas.

Specifications

Recommended Uses For Product	Educational: teaching and learning about the periodic table of elements in a classroom or similar educational setting
Indoor Outdoor Usage	Indoor
Seasons	all, fall
Color Family	black
Orientation	Landscape
Color	Multicolor
Item Shape	Rectangular
Style	Basic
Theme	Educational,Number,Science
Wall Art Form	Poster
Room Type	Bedroom
Mounting Type	Wall Mount
Frame Type	Unframed
Special Features	Durability, Easy Maintenance, Educational Effectiveness
Paint Type	Watercolor
Finish Type	Glossy
Material	Laminated
Paper Finish	Matte
Frame Material	Plastic
Cover Material	Plastic
Item Weight	1.5 Ounces
Size	15x20
Item Dimensions L x W	0.03"L x 16"W
Unit Count	1 Count

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