Langue étrangère 2

Atoms are the basic building blocks of matter. Anything that takes up space and anything with mass is made up of atoms. An atom is a particle of matter that uniquely defines a chemical element.  It consists of a central nucleus that is surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.

Depending on their composition, the different chemical elements are represented and distinguished in the periodic table. Each of the elements has an atomic number and a mass number.

   The orerall charge of An atom  is Zero. Once it  gives up or receives electrons,  it becomes ion. Ions can be either positively charged or negatively charged. When an atom loses electrons it becomes  Cation. However, when it gains electron  from any other atom  it  becomes  anion.

The   four fundamental forces of nature govern everything in the universe and hold atoms, planets, stars, solar systems, galaxies together.

  Mathematics is the science of  logical  reasoning and problem-solving . It evolved from counting, calculation, measurement, and the systematic study of the shapes and motions of physical objects. 

mathematics  is the science of relation and order. It helps to  understand and solve different kinds of problems in academic as well as in real life situations. Solving mathematical problems is  regarded as the best brain exercise.