Question

14. Using the periodic table, write the name and symbol of the element with the following atomic number: a. Z-28 b. Z= 13 c. Z-88 d. Z-33 e. Z- 50 15. Complete the following table for the three naturally occurring isotopes of silicon, the major component in computer chips: Atomic Number Mass Number Number of Protons Number of Neutrons Number of Electrons 16. Write the electron arrangement for each of the following elements and determine group and period. а. охудen b. chlorine c. carbon d. argon e. potassium f. silicon g. helium h. nitrogen

Answer 1

14 answers is Electronic configuration of Z = atomic number Atomic number Electronic configuration Element Number of symbol / Name electrons Ni /Nickel 28 28 [Ar]3d 4s Al/ Aluminium * 1s 2s 2p 3s 3p45328 [Ne] 3s 3p' = 152s22p 3s 3p [Rn] 7s? [Ar]3d" 48 4p [Kr] 4a" 5sº 5p Ra/Radium As / Arsenic Sn / Tin 88 33 1s 2s 2p"383p 4s 3d"4p5s4d5p? The zero group elements atomic numbers are Ne = 10, Ar = 18, Kr = 36, Xe = 54, Rn = 86. 15th answer is In a neutral element no. protons = Atomic number = no. of electrons. For example: X is an element with atomic number is x, then protons = electrons = X. General atomic symbol is 4x Here Z = atomic number = number of protons A = mass number = number of protons + number of neutrons X is chemical symbol of an element In an neutral atom no. of protons = no. of electrons

si 30 Si 28 Si 14 atomic number Mass number (no. of protons + no. neutrons) number of protons = atomic number 28 - 14 = 14 29 - 14 = 15 30 -14 = 16 Number of neutrons (mass number number of protons) Number of electrons (atomic number) 14