![]() ![]() Thus, the number of neutrons in an element is obtained from the difference between the number of atomic masses and the number of atoms. That is, the number of atomic masses (A) = p + n Therefore, the total number of protons and neutrons is called the atomic mass number. Therefore, atomic mass refers to the total mass of protons and neutrons.Ītomic mass (A) = nucleus mass = total mass of protons and neutrons (p + n)Īgain, the mass of each proton and neutron is about 1amu. The nucleus is made up of protons and neutrons. Therefore, the mass of the nucleus is called atomic mass. One is a positively charged particle proton and the other is a charge-neutral particle neutron.Īlmost all the mass of the atom is accumulated in the nucleus. Which of the following is the proper explanation for this difference in atomic radius between fluorine and chlorine As you move from chlorine to fluorine on the periodic table, the value of n for the outermost electrons decreases, so the atomic radius decreases. There are two types of particles in the nucleus. The atomic radius of fluorine is smaller than the atomic radius of chlorine. We already know that the nucleus is at the center of the atom. Relationship between the atomic mass and atomic number To know these properties of fluorine one must know the atomic number of fluorine. Therefore, fluorine is the p-block element.įluorine forms bonds by receiving or sharing electrons from other elements. The last electrons of fluorine enter the p-orbital. So, the valence electrons of fluorine are seven. And the last shell has a total of seven electrons. The last shell of fluorine has an unpaired electron, so the valency of fluorine is 1. Therefore, the number of negatively charged electrons orbiting in its orbit is equal to the number of positively charged protons in the nucleus.Ītomic number (Z) = Number of charges in the nucleus (p) Importance of the atomic number of fluorine That is the total number of protons in the atomic number. We know that protons are located in the nucleus of an atom as a positive charge. This number is equal to the serial number of the periodic table. The atomic number of the element is expressed by ‘Z’. Thus, the number of positive charges present in the nucleus of an element is called the atomic number of that element. He named that number the order of the atoms. The results of the experiment show that each element has a unique integer equal to the number of positive charges in the nucleus of that element. Scientist Henry Gwyn Jeffreys Moseley researched the X-ray spectrum of various elements in 1913-1914. Relationship between the atomic mass and atomic number.From the options we see that only option A validates this fact. It is known that the Van der Waals radius is greater than the covalent radius. Importance of the atomic number of fluorine Correct option is A) The radius of flourine is measured using covalent radius whereas that of neon is measured using Van der Waals radius.
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