iron, oxygen (ofcoarse) and a few others
Most elements are completely stable and safe. However, the safest elements would be the most unreactive. So, in that sense, the Inert Gases (exc. Radon, which is radioactive) are probably the safest group of elements, as they are completely unreactive.
Yes, minerals can be formed by non-metallic elements. In fact, many minerals are composed of non-metallic elements such as oxygen, carbon, sulfur, and silicon. These elements combine in various ways to form the crystalline structures that make up minerals.
Elements are not intrinsically either bad or good, though I've never trusted samarium. Oh yeah, it wants you to think "hey, good samarium, I think I heard a story about that" but then you're just playing right into its hands. Many elements are toxic. Some of the ones that are toxic in large quantities are essentially to the proper functioning of your body in small quantities... potassium, for example. Potassium is absolutely essential to proper brain and nerve function. It's also part of what they give criminals executed by lethal injection, to stop their hearts. Also, just because an element is toxic doesn't mean it's "bad". Uranium is toxic, but the lights wouldn't be on at my house without it.
NO. Hydrogen gas is non-toxic. However, it can displace oxygen (and if hot enough burn in it) and thus can be an asphynxant in large quantities. But hydrogen by it self is not toxic at all.
The halogens are located on the left of the noble gases on the periodic table. These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
No elements are removed.H2O2 can be broken into water and O2.
They need to be non-toxic, non-reactive, relatively durable, of known purity, and ease of workability is a bonus too.
No, it is non toxic.
Metals that contained paints or aerosols are not recyclable. Products that were considered to be toxic are not able to be recyclable. Random pieces of metal, metal wire hangers, and any non copper pipes are also metal that can not be recycled.
Yes, almost all salamanders are non-toxic.
Ammonia is ammonia and ammonia is toxic. Non-toxic ammonia does not exist. Ammonia can be diluted in water or held in a sealed container, but it's still toxic.
Yes, vacuum cleaner bags can be non-toxic. Oreck makes one that is non-toxic to both humans and pets. They also make vacuum cleaner tablets that you drop into your bag to freshen the smell that are non-toxic.
Chlorofluorocarbons (CFCs) are non-toxic.
If it says on the label that the product is non-toxic then it's safe. They are not legally able to put it on the label if it isn't non-toxic.
"Non-toxic" generally means non-toxic to animals and specifically to humans. It's possible for something to be more or less innocuous to animals but highly toxic to plant life. Copper, for example.
Yes, the slime is non-toxic and safe for children to play with.
Yes, the crib finish is baby safe and non-toxic.