Elements necessary for humans

At present there are 118 elements listed in the periodic table. Some of these elements are commonly found on the earth in the form of ores. Some are radioactive and have very short half lives. Many such elements have been synthesized in the laboratory and live for a very short time.

Human body like other things existing is made of compounds which are made from the elements. Out of these 118 only some elements are connected with the human body.

Although elements as such don’t make up the body it is the combined form that is molecules constitute the human body. But elemental composition is as follows by mass.

Oxygen: 65%

Carbon: 18%

Hydrogen: 10%

Nitrogen: 3%

Other elements: 4%

Other elements include Calcium, Potassium, Phosphorus, Sulphur, Sodium, Chlorine, Magnesium, Boron, Chromium, Cobalt, Copper,  Fluorine, Iodine, Iron, Manganese, Molybdenum, Selenium, Silicon, Tin, Vanadium and Zinc.

Although these elements are used in very minor amount, they are crucial to some body processes.

Elements can be divided into different groups according to the functions they perform.

Building Blocks

The main building blocks of the body are proteins which are synthesized from amino acids. For these elements used are Hydrogen, Carbon, Nitrogen, Oxygen, Phosphorus and Sulphur. DNA also contains these elements except Sulphur. DNA is the genetic code.

Enzymes

Enzymes are chemicals which are catalysts for carrying out chemical reactions like breakdown of sugars and other macro molecules. Such enzymes use some elements like Magnesium, Manganese, Copper, Zinc, Selenium and Molybdenum. Enzymes play role in respiration, digestion, metabolism and immune system.

Nerves and Control

Brain sends messages to different parts of the body and this is a two way communication. Electrical signals are carried through electrolytic solutions like brines. Sodium, Potassium and Calcium ions this play the role of transmitting the signals. Similarly Chloride ions regulate the water in and out of cells. Iodine is used to make hormones which regulate metabolism.

Bones and Teeth

Bones make the template on which our body is hoisted. Strong bones and teeth are essential for the healthy body.  Bones and Teeth are made of Calcium and phosphate. Phosphate contains Phosphorus and Oxygen. Manganese element makes more stronger and resistance to breaking.

Blood

Blood is the lifeline of the body. Blood carries oxygen to the cells and removes the carbon-dioxide gas which is the byproduct of combustion reaction. Oxygen is carried by blood due to the presence of iron which binds the Oxygen. Other elements which are constituents of blood are Carbon, Oxygen, Iron and Cobalt. Cobalt is essential to make red blood cells.

Respiration and Energy

Respiration is inhalation of Oxygen. Adinosine Triphosphate (ATP) is formed during respiration which is the compound used by body as energy. Main elements involved here are Carbon, Nitrogen, Phosphorus and Oxygen.

Source: c&en magazine of American Chemical Society (ACS)

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1905: Annus Mirabilis of Albert Einstein 

Annus mirabilis is a Latin phrase that means “wonderful year”, “miraculous year” or “amazing year”. This term was originally used to refer to the year 1666, and today is used to refer to several years during which events of major importance are remembered.

Albert Einstein singlehandedly added 1905 as another Annus Mirabilis. In this year, his creativity peaked and he made the revolutionary scientific discoveries. He was just 26 years old. During that year he did:

{
March: Proved that the light consists of photons thus proving the quantum nature of the light.

May: Proved the existence of the atom.

June: Special Theory of Relativity, which forced the laws of motion by another great physicist Newton as the corollary with the objects moving at lower speeds.

November: The most conscise and beautiful equation relating mass and energy. Proving that mass and energy are two names of the same thing. That enormous amounts of energy are condensed to make small amounts of mass. In other words, enormous amounts of energy are contained in the mass.

E=mc2

And after that he became a superstar

}

Why Gold has the colour it has??

Gold as everyone knows is a noble metal sought after by everyone. By being noble means it is resistant to chemical reactions like corrosion by air and water combination.

The answer tothe question why it has the colour it has lies in electronic configuration of gold atoms.  Its electronic configuration is [Xe] 4f14 5d10 6s1 where Xe stands for Xenon. The outermost orbitals are 5d and 6s.  There is one electron in the outermost shell. In the geometric structure, atoms are arranged in a particular config And the lone electrons present the 6s orbitals are diffused in the lattice which means that individual electron in a atom has lost the address of parent atom and now belong to the community of gold atoms.

How do the objects we see have different colours? Colours are hidden in white light emanating from the sun. The visible spectrum of light components is composite of 7 colours remembered using “VIBGYOR” where V is for violet and has the maximum energy in the visible spectrum and R is for red with lowest energy.

When it falls on an object, the object absorbs some fraction of the light and reflects the rest of it. Which color or colors wavelengths it will absorb depends upon the unique structure of the object molecules. We see the resultant of colours which are reflected.

IMG_2064

 

In case of gold, the energy difference between the 5d and 6s levels is 2.7 electron volts. The blue light has exactly this energy in its photon packets. So when light falls on it, it completely absorbs the blue fraction of the light. The remains reflected resultant light is exactly the colour which is that of gold.

First observation of merger of two neutron stars

Neutron stars are the remnants of explosions of supernovae. Neutron stars are most dense in the universe so these are quite small in size. For example the size of London. They are so dense that a spoonful of neutrons weighs as much as 100 000 Eiffel towers.

It so happens that when two neutron stars approach each other, they turn faster and faster generating the gravitational waves by modifying the space-time around them. Ultimately they collide and fuse. After this the eject lots of matter.

How such events in occuring in the universe are detected? Electromagnetic rays emitted during such an event in the form of visible and invisible energy waves can be tracked by the modern telescopes and spectrometry.

Another technique has been added and it measures the gravitational waves which are generated in such violent events involving massive bodies. Such instruments has been installed in US. Called LIGO (Laser interferometer Gravitational-Wave Observatory) can record the gravitational waves.

One such event of fusion of two neutron stars happened 130 million years ago. The gravitational ripples were detected by LIGO on August 17 at 1241 GMT for 100 seconds. Then after 2 seconds a Gamma rays burst was observed. After hours and days following the event, X-rays, UV rays and infrared rays were detected.

This is the first successful observation of fusion of two neutron stars through Gravitational Waves and as well as through different kind of rays that are emitted.

It also confirmed the premise that gravitational waves travel with speed equal to that of light. This event was made possible with the collaboration of 3674 scientists from 953 institutions all around the world.

 

Oil and Gas

Although researchers all over the world are working on the technology to harness the alternate resources of energy like solar, wind, hydropower and nuclear energy, the conventional resources of oil, gas and coal are still the major resources of energy. These resources are fast declining since they are non renewable. Rapid industrialization and urbanization are responsible for this. In addition, these conventional resources add pollutants to the atmosphere.

Presently the positon of energy producers is like this

World’s Biggest Oil & Gas Companies
(Production in millions barrels per day)

  1. SAUDI ARAMCO: 12
  2. GAZPROM: 8.33.
  3. NATIONAL IRANIAN OIL: 6
  4. EXXONMOBIL: 4.7
  5. ROSNEFT: 4.7
  6. PETROCHINA: 4
  7. BRITISH PETROLEUM: 3.7
  8. ROYAL DUTCH SHELL: 3.7
  9. PETROLEOS MEXICANOS: 3.6
  10. KUWAIT PETROL CORP: 3.4

Top 5 countries with highest Oil Reserves
1. Saudi Arabia:
265 billion barrels (19.1%)
Remaining reserves: 72.4 years
2. Venezuela:
211 billion barrels(15.3%)
Remaining reserves: 234.1years
3. Iran:
137 billion barrels(9.9%)
Remaining reserves: 88.4 years
4. Iraq:
115 billion barrels (8.4%)
Remaining reserves: 128.1 years
5. Kuwait:
102 billion (7.3%)
Remaining reserves: 110.9 years

Global Energy Sources
Fossil Fuels
Oil: 33%
Coal: 30%
Natural Gas: 24%
Renewable and Nuclear Energy
Hydropower: 7%
Nuclear Power: 4%
Renewable energy: 2.7%

(The data is from visual capitalist)