![]() Which one of the following ions has the highest value… (DUET 2008)Īns.The value of electronegativity of /atoms A and… (DUET 2009).Correct order of 1st ionisation potential (IP) among following elements… (NEET 2001).In the periodic table from left to right in a period, the… (NEET 1993).Identify the wrong statement in the following… (NEET 2012).Which of the following has highest ionisation energy… (DUET 2008).Which of the following pairs has both members from the same….The IUPAC symbol for the element with atomic number… (JEE Main 2019).The atomic number of an element refers to the order in which they appear on the periodic table.The symbols of elements are derived from the first letter of their names, with the second letter of their names occasionally added. ![]() The first 20 elements of the periodic table are very crucial and are an integral part of our daily lives. ![]() There are 118 known elements at present with the first 94 elements being natural and the rest 24 being man-made elements.An element is a substance that cannot be broken down or transformed into another substance by chemical methods.Electrons: They are subatomic particles that are negatively charged.Neutrons and protons together add up to form the nucleus of the atom. Neutrons: They are subatomic particles with a neutral charge.Protons: They are subatomic particles that have a positive charge residing in the nucleus of an atom of the element.The number of protons in an atom is called its atomic number. Atomic Number: The number of protons in an atom's nucleus or the number of electrons in an electrically neutral atom equals the atomic number.This is often stated in terms of a unified atomic mass unit (amu) as per the international agreement. The atomic mass is the mass of an atomic particle. Atomic Mass: Every particle of matter, no matter how small or big, has some mass connected with it.There are three noble gases in the first 20 elements namely, The noble gases were discovered later than other elements. Noble gases, also known as inert gases, are the least reactive or extremely non-reactive elements. White Phosphorous is also used in the military to make weapons. Phosphorus (P): Phosphorus is an essential component of ATP, which is the energy currency of the body.Silicon (Si): Silicon acts as a semiconductor and is used in computer chips.Calcium (Ca): Calcium is a very essential component that helps in maintaining bone strength. ![]()
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