Whom and when chemical elements were discovered

Whom and when chemical elements were discovered

Scientists discovered chemical elements till 1500, then in the Middle Ages, already during Modern times and continue to open now. It was promoted development of science in the age of Enlightenment, industrial jump in the history of mankind, opening in spectroscopy, quantum mechanics and nuclear fusion. So what elements by whom and when were recorded and included in the chemical table?

Falklands war of 1982: reasons and result of the conflict

Falklands war of 1982: reasons and result of the conflict

On April 2, 1982 10 weeks bloody war between Great Britain and Argentina for the right of possession of the Falkland Islands which received the name the Falklands or Malvinsky war began.

Doomsday: reality or myth

Doomsday: reality or myth

The mankind is frightened approaching doomsday for a long time. Recently misfortunes and global disasters foretell on several for a year, however people are still alive. However if to depart from myths and predictions and to look at scientific forecasts, doomsday will be present also at them.

How to learn resistor resistance

How to learn resistor resistance

It is possible to learn resistor resistance, having connected to it an ohmmeter. If such device is unavailable, connect the resistor to a current source, measure value of current in chains and tension on the resistor. After that calculate its resistance. If codings or color strips are caused on the resistor, determine resistance by them.

What is allelic genes

What is allelic genes

The set of the various genes operating as a unit and which are responsible for certain signs enters a genotype. Diploidic organisms differ from haploid in two genes which are responsible for each sign – these genes are called allelic. What is represented by allelic genes and as they interact among themselves?