Question

8. Which elements are represented by the following electron configurations? a. 15-2s 2p 3s 3p 3d 10 452 4p highest occupied orbitals valence electrons b. 1s 2s 2p 3s 3p 4s 3d highest occupied orbitals_ valence electrons c. [Kr] 5s 4d 0 5p? highest occupied orbitals valence electrons d. [Ne] 3s 3p highest occupied orbitals valence electrons e. [Ar]3d 4s? highest occupied orbitals valence electrons

Answer 1

@ In electron shell is generally highest occupied Called Valence shell If electrons are present in Valence electrons. this shell, called • 45² 403 Highest occupied Total electrons = 33= Atomic humber Element: AS orbitals are: 45² 4p3 Valence electrons = 2+] = Ś 24 1525 Total electrons = 25= Atomic number Element =mn Highest occupied orbitals are 45 :: Valence electrons = 1, But But in d orbitals, a elections also using for bonding. : In transition metals asa (n-1)d electrons are valence electrons. ns and S : 4s ad - 7 electrons are Valence electrons.

0 [kr] 55² 4d 5p² Total electrons = So, Atomic number= 50 Element Sn CI Highest occupied orbitals are : 55²50² . Valence electrons = 2+2=4 Ne] 35 3p Total electrons = 10+2+5=15= Atomic number - Element=P highest occupied orbitals are: 383ps . Valence electrons = 2+5 = 1 ☺ [Ar] 34'45" Total electrons = 18 +1+2=21= Atomic number highest occupied orbitals are: 45² Element = sc This is transition metal (d block element) a Valence elections. elections are ns and (n-1) d orbital Valence electrons = 1+2 =3