{"id":19270,"date":"2018-01-26T10:41:39","date_gmt":"2018-01-26T10:41:39","guid":{"rendered":"https:\/\/www.aplustopper.com\/?p=19270"},"modified":"2020-11-23T17:26:22","modified_gmt":"2020-11-23T11:56:22","slug":"frank-icse-solutions-class-9-chemistry-atomic-structure","status":"publish","type":"post","link":"https:\/\/www.aplustopper.com\/frank-icse-solutions-class-9-chemistry-atomic-structure\/","title":{"rendered":"Frank ICSE Solutions for Class 9 Chemistry – Atomic Structure"},"content":{"rendered":"
PAGE NO :113<\/strong><\/span> Solution 2:<\/strong><\/span> Solution 3:<\/strong><\/span><\/p>\n Solution 4:<\/strong><\/span><\/p>\n Three fundamental particles of an atom are-<\/p>\n Solution 5:<\/strong><\/span><\/p>\n Solution 6: Solution 7: Solution 8: Solution 9: Solution 10:<\/strong><\/span> Solution 11: Solution 12: Solution 13:<\/strong><\/span><\/p>\n Solution 14:<\/strong><\/span><\/p>\n PAGE NO :114 Solution 16: Solution 17: Solution 18:<\/strong><\/span><\/p>\n Solution 19:<\/strong><\/span> Solution 20: Solution 21: Solution 22: Solution 23:<\/strong><\/span><\/p>\n Solution 24:<\/strong><\/span><\/p>\n Solution 25: Chemistry<\/a>Biology<\/a>Physics<\/a>Maths<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" Frank ICSE Solutions for Class 9 Chemistry – Atomic Structure PAGE NO :113 Solution 1: Solution 2: Solution 3: (a) Mass of an atom – Protons and neutrons (b) Size of an atom – Electrons Solution 4: Three fundamental particles of an atom are- Proton Electron Neutron Solution 5: (a) An atom – An atom […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[84,6444,6442,3034],"tags":[6813,6818,6817,6832,6831,6848,6824,6811,6830],"yoast_head":"\n
\nSolution 1:<\/strong><\/span>
\n<\/p>\n
\n<\/p>\n\n
\n
\n
\n<\/strong><\/span>Atomic number – The number of protons present in the nucleus of an atom is called the atomic number of the atom.
\nIt is denoted by ‘Z’.<\/p>\n
\n<\/strong><\/span>The protons and neutrons are collectively called as nucleons.<\/p>\n
\n<\/strong><\/span>Isotopes are atoms of the same element, having the same atomic number, same chemical properties but different mass number, i.e., the atoms differ in the number of neutrons. The three isotopes of hydrogen atoms are-<\/p>\n\n
\n<\/strong><\/span>Electrons take part in a chemical reaction. Therefore, the chemical properties of an element depend upon the electronic configuration. Since, isotopes of an element have the same atomic number and hence same electronic configuration. So, they exhibit the same chemical properties.<\/p>\n
\n<\/p>\n
\n<\/strong><\/span>The outermost orbit of an element is called valence shell. The electrons present in the outermost orbit (valence shell) of an element are called valence electrons.<\/p>\n
\n<\/strong><\/span>Atoms may have incomplete octet. During the formation of a molecule, an atom of a particular element gains, loses or shares electrons until it acquires a stable configuration of eight electrons in its valence shell.<\/p>\n\n
\n
\nB=3
\nC=2
\nD=1
\nE=1<\/li>\n
\n<\/strong><\/span>Solution 15:
\n<\/strong><\/span>“During the formation of the molecule, an atom of a particular element gains, loses electrons or shares electrons until it acquires a stable configuration of eight electrons in its valence shell” i.e. until it acquires octet.<\/p>\n
\n<\/strong><\/span>K can accommodate maximum of 2 electrons.
\nL can accommodate maximum of 8 electrons.
\nM can accommodate maximum of 18 electrons.<\/p>\n
\n<\/strong><\/span>Cathode rays are formed at the negative electrode of the discharge tube experiment.<\/p>\n\n
\n<\/p>\n
\n<\/strong><\/span>Electronic configuration of magnesium is -2, 8, 2. Since, it has 2 electrons in its valence shell, so its valency is 2.<\/p>\n
\n<\/strong><\/span>Number of electrons in Sodium = 11
\nNumber of protons in sodium = 11
\nNumber of neutrons in sodium = 12
\nNumber of nucleons in sodium = 23<\/p>\n
\n<\/strong><\/span>Inert elements are the elements which have completely filled valence shell. Since, they are already stable and do not need more electrons, they do not combine with other atoms. So, they exist as monoatoms in molecule.<\/p>\n\n
\n
\n<\/strong><\/span>Atomic number is the number of protons of an atom which is unique to an atom but mass number is the total of number of protons and number of neutrons which may or may not be same to other atoms since there is probability of combination of number of protons and number of neutrons be same for two atoms.<\/p>\n