Periodic Table Choice Board - Who Am I?

I am the lightest metalloid. I have a group named after me. I am a solid at STP. What am I?

I am Boron

I am part of the Actinide series often shown below the periodic table. I am often mistaken for gadolinium. Under ultraviolet light my ions exhibit a yellow-orange glow. I have weird magnetic properties, changing states in different temperatures. What am I?

I am Curium

I am a soft, silvery blue metal. However in my liquid form I am silvery white. I am similar to the metals in my group, including aluminum. I expand over 3% when solidifying so I can't be kept in rigid containers. I attack other metals, making metals like steel very brittle, by diffusing them into metal lattice. However I also can stabilize plutonium in nuclear cores. What am I?

I am Gallium

I am nicknamed "quicksilver". My melting point and freezing point are the lowest of any stable metal. I used to be used in thermometers. What am I?

I am Mercury

I am a transition metal between Cobalt and Copper. I am one of only 4 elements that is magnetic at or near room temperature. I can take a high shine. What am I?

I am Nickel

I am a reactive nonmetal with two stable isotopes. I am a pnictogen with a group named after me. I am in all living things and make up 78% of the atmosphere, but I am colorless and odorless. What am I?

I am Nitrogen

I am an Alkali Metal below Sodium. I'm plentiful in bananas. I am silvery unless I am exposed to air, in which I immediately tarnish to grey. I emit a lavender color in a flame test. What am I?

I am Potassium

I am part of the Lanthanide series and have 6 atomic shells. I have the second largest atomic radius of all Lanthanoids. I am so rare, that at any given time there is only about 500-600 grams of me naturally occurring in the Earth's crust. With my rarity and instability, many tests have not yet been completed about me. What am I?

I am Promethium

My name is Swedish for "heavy stone", even though I'm a transition metal. I am the heaviest element known to be essential to any living organism. When I'm pure, I am stronger than most steels and malleable enough to be worked. In my pure form I have the highest melting point of any other metal. What am I?

I am Tungsten

I am a colorless, odorless, and dense noble gas. I am over 4 times denser than the atmosphere of Earth at sea level. When electrically excited I glow a blue or lavender color. I have the most isotopes on the periodic table. What am I?

I am Xenon