https://youtu.be/z4qbtlbV7uA?list=PLIQkEkEOvayKVu39wdXmwH1nM0MXw0rZ-&t=3838https://youtu.be/ZTlMt4Evwnk?list=PLIQkEkEOvayKVu39wdXmwH1nM0MXw0rZ-&t=1784https://www.youtube.com/watch?v=u9gyD2KRAp0&list=PLIQkEkEOvayKVu39wdXmwH1nM0MXw0rZ-&index=101.The diameter of a typical atom is about 10,1000 times the diameter of its nucleus.2.Z for atomic number, equal to the number of protons in its nucleus.(same number of electrons)3.Isotopes - Same element with different masses.4.12C, 13C, 14C are isotopes of one another and are radio actives..14C is used for carbon dating.5.2H deuterium, 3H tritium.6. 14N and 15N, count number of protons and neutrons. Ans. Nitrogen has 7 atomic number so 7 protons means 14-7 = 7 neutrons. For 15N, 15-7 = 8 neutrons and 7 protons7.Electronegativity : is a measure of the ability of an atom to attract electrons.8.Covalent bonds form by sharing of electrons between atoms of similar electronegativities to achieve the configuration of a noble gas.9.switch(move2){ case '1': if(space[0]!='O') { if(space[0]!='X')space[0]='O'; flag=1; break; } case '2': if(space[1]!='O') { if(space[1]!='X')space[1]='O'; flag=1; break; } case '3': if(space[2]!='O') { if(space[2]!='X')space[2]='O'; flag=1; break; } case '4': if(space[3]!='O') { if(space[3]!='X')space[3]='O'; flag=1; break; } case '5': if(space[4]!='O') { if(space[4]!='X')space[4]='O'; flag=1; break; } case '6': if(space[5]!='O') { if(space[5]!='X')space[5]='O'; flag=1; break; } case '7': if(space[6]!='O') { if(space[6]!='X')space[6]='O'; flag=1; break; } case '8': if(space[7]!='O') { if(space[7]!='X')space[7]='O'; flag=1; break; } case '9': if(space[8]!='O') { if(space[8]!='X')space[8]='O'; flag=1; break; }}cout