Among the metals that are currently known to be essential for normal biological functions in humans are sodium (Na), potassium (K), magnesium (Mg), and calcium (Ca) that belong to main group of elements, and vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn).

​Minerals. Minerals are solid substances that have formed naturally in the Earth. Most rocks that we see today are made of minerals (they are the ‘ingredients’ in rocks) and both precious metals and gems are subsets of minerals.

Metal- An alloy of two or more metallic elements. Therefore, Rocks have minerals, which in large concentration are called ores and these are mined for metals!

Minerals are made of chemicals – either a single chemical element or a combination of chemical elements. Metal- An alloy of two or more metallic elements. Therefore, Rocks have minerals, which in large concentration are called ores and these are mined for metals!

A mineral is an element or chemical compound that is normally crystalline and that has been formed as a result of geological processes. Examples include quartz, feldspar minerals, calcite, sulfur and the clay minerals such as kaolinite and smectite.

metals in the body There are no metals normally present as such in the body, except those put there during surgery.

Iron

1 Iron. Iron is a useful heavy metal in the human body as it is a constituent of certain biological molecules like the hemoglobin and involved in various physiological activities.

tungsten

Gold and silver are both classified as heavy metals but are by no means toxic. Some of the most common toxic metals are lead, mercury, cadmium, arsenic and chromium. Other heavier metals that have noted levels of toxicity are zinc, iron and copper.

Tungsten: One Of The Heaviest Metals & A Hard Act To Follow

Revolving Service Structure

The Sun

Graphene Aerogel, world’s lightest substance.

Helium is the second most abundant element in the universe, after hydrogen. Helium has monatomic molecules, and is the lightest of all gases except hydrogen. . Helium, like the other noble gases, is chemically inert.

The first seven metals in the periodic table are lithium, beryllium, sodium, magnesium, aluminium, potassium and calcium, known collectively as the “lightest metals”.

The mass of the observable universe is often quoted as 1050 tonnes or 1053 kg.

The end result is unknown; a simple estimation would have all the matter and space-time in the universe collapse into a dimensionless singularity back into how the universe started with the Big Bang, but at these scales unknown quantum effects need to be considered (see Quantum gravity).

A typical stellar-class of black hole has a mass between about 3 and 10 solar masses. Supermassive black holes exist in the center of most galaxies, including our own Milky Way Galaxy. They are astonishingly heavy, with masses ranging from millions to billions of solar masses.

But “infinity” means that, beyond the observable universe, you won’t just find more planets and stars and other forms of material…you will eventually find every possible thing.