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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Periodic Table Science Poster Laminated Chart Teaching White Elements Classroom Decoration Premium Educators Atomic Number Guide 18x24 edu_LPeriodic_White_2

产品编号: 257667971

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细节

Size
0.1L x 45.7W
Product dimensions
1L x 457W
Number of Items
1
Orientation
Landscape
Shape
Rectangular

💧3 mil laminated water & tear resistant

📏18x24 inch perfect viewing size

🔢Clear atomic number guide

描述

🧪 Elevate your classroom game with the ultimate science statement piece!

CRYSTAL CLEAR FROM AFAR - Designed with a clean, minimalist white background for effortless readability even at a distance.
DURABILITY MEETS DESIGN - Premium 3 mil laminated finish ensures water and tear resistance, built to last through countless lessons.
SLEEK CLASSROOM UPGRADE - Elevate your teaching space with a modern, professional periodic table that doubles as stylish decor.
TEACHER APPROVED LAYOUT - Optimized for educators with clear element symbols and atomic numbers to streamline learning.
LIGHTWEIGHT READY TO HANG - At just 59g and standard poster size, it’s easy to mount and reposition without hassle.

This 18x24 inch laminated periodic table poster features a premium 3 mil plastic finish that is water and tear resistant, designed specifically for educators. Its clear white background and atomic number guide make it easy to read from a distance, combining durability with sleek classroom aesthetics.

规格

Product Dimensions	0.08 x 45.72 x 0.51 cm; 59 g
Finish types	Plastic
Number of pieces	1
Batteries required	No

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