Periodic Table

I'm an invisible gas. You can test for my presence with a glowing splint. I light it back up!

I'm a combustible gas with one valence electron. 

I'm an alkaline earth metal. Sometimes you can find me as a shiny ribbon. 

When I combine with sulfur I make a blue, crystal powder. 

I'm a truly inert gas with 8 valence electrons. I belong to the "noble" gas family.

I am an alkaline earth metal with the same number of protons, neutrons AND electrons!

These elements are similar to, but harder and denser than the alkali metals. 

This family of elements are non-metals, highly reactive, form salts + have 7 valence electrons.

I'm an alkaline earth metal with 38 electrons.

I am in the same family as oxygen but I am a yellow powder and I smell really bad.

I'm a transition metal with 25 protons.

These make good semi-conductors. They have both metallic and non-metallic properties. 

I'm shiny, soft and reactive with water! Who am I?

I'm a non-metal with 16 neutrons!

These elements can have valence electrons in more than one shell/orbital.

This is the MOST reactive alkali metal!

I'm a liquid at room temperature