KERALA PSC / CHEMISTRY / PERIODIC TABLE / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

 

KERALA PSC / CHEMISTRY / PERIODIC TABLE / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

KERALA PSC / CHEMISTRY / PERIODIC TABLE / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY

·      Periodic table contains 7 horizontal rows called periods and 18 vertical columns called groups

·      Elements of group 1 are called Alkali metals. Elements of group 2 are called Alkaline earth metals. Elements of group 17 are called Halogens. Elements of group 18 are called Nobel gase

·      There are 116 elements known today, out by which 90 are naturally existing

·      First period contains only 2 elements; this is the shortest periods

·      The sixth period consists of 32 elements this is the longest periods

·      Elements of group zero show little reactivity and are termed noble gases

·      Elements of atomic number 87 to 105 are radioactive elements

·      The first man made element is Technicium (atomic no: 43)

·      Promethium is also a man-made element (atomic no: 63)

·      Elements from atomic number 93 onwards do not occur in nature. So they are called synthetic or transuranic elements

·      Manmade elements are known as transuranics

·      Elements from atomic number 58 to 71 are lanthanides or rare earths

·      Elements from atomic number 90 to 103 are termed as actinides

·      Noble gases are listed in group 18 of modern periodic table

·      Modern Periodic Table is based on atomic number of elements

·      Mendeleev’s Periodic Table is based on atomic weights

·      The Father of periodic table is Mendeleev

KERALA PSC / CHEMISTRY / PERIODIC TABLE / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY