Helium (He) is a chemical element of the periodic table, located in the group 18 and the period 1, and is having the atomic number 2. It is a colorless, odorless, tasteless, non-toxic gas, whose name comes from the Greek word “helios”, which means sun. It is the first element in the noble gas group. … Read more
Iodine (I) is a chemical element of the periodic table, located in the group 17 and the period 5, and has the atomic number 53. It is a lustrous, black reactive nonmetal, whose name comes from the Greek word “iodes”, which means violet. It is counted as one of the heaviest elements in the halogen … Read more
Bromine (Br) is a chemical element of the periodic table, located in the group 17 and the period 4, and has the atomic number 35. It is a reddish-brown liquid, whose name comes from the Greek word “bromos”, which means stench. It is a reactive nonmetal and is the third lightest halogen, after the chlorine … Read more
Selenium (Se) is a chemical element of the periodic table, located in the group 16 and the period 4, and has the atomic number 34. It is a red powder or black reactive nonmetal, whose name comes from the Greek word “selene”, which means Moon. It is a member of the chalcogen group. On periodic … Read more
Chlorine (Cl) is a chemical element of the periodic table, located in the group 17 and the period 3, and is having the atomic number 17. It is a pale, greenish-yellow gas, whose name comes from the Greek word “chloros”, which means greenish yellow. It is a reactive nonmetal and is the 19th most abundant … Read more
Sulfur (S), also spelled as sulphur (in British English) is a chemical element of the periodic table, located in the group 16 and the period 3, and is having the atomic number 16. It is a brittle, pale yellow reactive nonmetal, whose name comes from the Sanskrit word “sulvere” or Latin word “sulfurium”. It is … Read more
Phosphorus (P) is a chemical element of the periodic table, located in the group 15 and the period 3, and is having the atomic number 15. It is a soft, waxy, yellow-white reactive nonmetal, whose name comes from the Greek word “phosphoros”, which means light bringer or light carrier. It is a member of the … Read more
Oxygen (O) is a chemical element of the periodic table, located in the group 16 and the period 2, and is having the atomic number 8. It is a colorless, odorless, tasteless gas, whose name comes from the Greek word “oxy genes”, which means acid forming. It is a reactive nonmetal and is the first … Read more
Nitrogen (N) is a chemical element of the periodic table, located in the group 15 and the period 2, and is having the atomic number 7. It is a colorless, odorless, tasteless gas, whose name comes from the Greek word “nitron” and “genes”, which means native soda forming. It is a reactive nonmetal and is … Read more
