Imibuzo Eyisibonelo Ngesakhiwo Se-Atomic: Ukuthola Izisekelo ZeKhemistri
Isakhiwo se-athomu siwumqondo oyisisekelo kumakhemikhali obalulekile ukuwuqonda. I-athomu iyunithi encane kakhulu yesakhi samakhemikhali esisagcina izakhiwo zaleso sakhi. Ukuqonda isakhiwo se-athomu kusisiza siqonde izakhiwo zomzimba nezamakhemikhali zento. Kulesi sihloko, sizoxoxa ngezibonelo eziningana zezinkinga kanye nezixazululo zazo ukuze sijulise ukuqonda kwethu isakhiwo se-athomu.
Isingeniso ku-Atomic Structure
Ulwazi ngesakhiwo se-athomu lwaqala ngemodeli ye-athomu kaDalton, eyayithi ama-athomu ayizinhlayiya ezincane kakhulu ezingenakuhlukaniswa kabanzi. Kodwa-ke, njengoba isayensi iqhubeka, lo mqondo wavela ngemibono efana nemodeli ka-J.J. Thomson ye-raisin pudding, imodeli ye-athomu kaRutherford, kanye nemodeli ye-quantum mechanics eyaphakanyiswa nguSchrödinger noHeisenberg.
Izingxenye Eziyinhloko Zama-Athomu
Ngaphambi kokuba singene ezinkingeni zesibonelo, kubalulekile ukuqonda izingxenye eziyisisekelo ze-athomu:
1. Ama-Proton: Izinhlayiya ezishajeke kahle ezitholakala kuyi-nucleus ye-athomu.
2. Ama-neutron: Izinhlayiya ezingathathi hlangothi eziku-nucleus ye-athomu kanye nama-proton.
3. Ama-electron: Izinhlayiya ezine-negative charge ezihambahambayo zizungeze i-nucleus kuma-orbital athile.
Imibuzo Eyisibonelo Nengxoxo
Umbuzo 1: Ukunquma Inani Lama-Proton, Ama-Neutron, Nama-Electron
Umbuzo:
I-athomu yekhabhoni inenombolo ye-athomu engu-6 kanye nenombolo yesisindo engu-12. Thola inani lama-proton, ama-neutron, nama-electron ku-athomu.
Ingxoxo:
Inombolo ye-athomu ikhombisa inani lama-proton ku-athomu. Ngakho-ke, nge-carbon:
– Inani lama-proton = 6
Njengoba i-athomu ingathathi hlangothi, inani lama-electron kumele lilingane nenani lama-proton:
– Inani lama-electron = 6
Inombolo yesisindo iyisamba sama-proton nama-neutron. Ngakho-ke,
– Inani lama-neutron = Inombolo yesisindo – Inani lama-proton = 12 – 6 = 6
Ngakho-ke, i-athomu yekhabhoni inama-proton ayi-6, ama-neutron ayi-6, nama-electron ayi-6.
Umbuzo 2: Ukucushwa kwe-Electron
Umbuzo:
Bhala ukucushwa kwe-electron ye-athomu ye-oxygen enenombolo ye-athomu 8.
Ingxoxo:
Ukucushwa kwe-electron kunqunywa ngokusekelwe kusimiso se-Aufbau, esithi ama-electron agcwalisa ama-orbital ngokuya ngamazinga awo aphansi kakhulu amandla kuqala. Ukuhleleka kokugcwaliswa kwe-orbital kanje:
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p
Inombolo ye-athomu 8:
– Ama-electron amabili okuqala agcwalisa i-1s -> 1s² orbital
– Ama-electron amabili alandelayo agcwalisa i-orbital ye-2s -> 2s²
– Ama-electron amane okugcina agcwalisa i-2p orbital -> 2p⁴
Ngakho-ke, ukucushwa kwe-electron kungu-1s² 2s² 2p⁴.
Umbuzo 3: Ama-Isotopes kanye ne-Relative Atomic Mass
Umbuzo:
I-chlorine inama-isotope amabili ayinhloko: i-Cl-35 kanye ne-Cl-37. Uma ubuningi be-isotope i-Cl-35 bungu-75.77% kanti i-Cl-37 ingu-24.23%, bala isisindo se-athomu se-chlorine.
Ingxoxo:
Isisindo se-athomu esihlobene (i-Ar) se-chlorine singabalwa kusetshenziswa isilinganiso sobuningi be-isotope ngayinye:
\[ Ar = (\text{Ubuningi be-Isotope 1} \times \text{Isisindo se-Isotope 1}) + (\text{Ubuningi be-Isotope 2} \times \text{Isisindo se-Isotope 2}) \]
Faka esikhundleni senala ngesimo sedesimali:
\[ Ar = (0.7577 \izikhathi ezingu-35) + (0.2423 \izikhathi ezingu-37) \]
\[ Ar = 26.5195 + 8.9651 \]
\[ Ar = 35.4846 \]
Ngakho-ke, isisindo se-athomu se-chlorine singama-35.48.
Umbuzo 4: Ukucushwa Kwe-Electron Kuma-Ion
Umbuzo:
Bhala ukucushwa kwe-electron ye-ion ye-Aluminium (Al³⁺), enenombolo ye-athomu engu-13.
Ingxoxo:
Ukucushwa kwe-electron ye-athomu ye-aluminium (Al) enenombolo ye-athomu 13:
1s² 2s² 2p⁶ 3s² 3p¹
Ku-ion ye-Al³⁺, ukulahleka kwama-electron amathathu kwenzeka kusukela ku-orbital engaphandle:
– Ama-electron ku-3p, ama-2 kusukela ku-3s.
Ngakho-ke, ukucushwa kwe-electron kwe-Al³⁺ yilokhu:
1s² 2s² 2p⁶
Umbuzo 5: Ama-electron e-Valence
Umbuzo:
Mangaki ama-electron e-valence akhona ku-athomu ye-phosphorus (P) enenombolo ye-athomu engu-15?
Ingxoxo:
Ukucushwa kwe-electron kwe-phosphorus (P):
1s² 2s² 2p⁶ 3s² 3p³
Ama-electron e-Valence angama-electron asegobolondweni elingaphandle:
– Kulesi simo, ku-3s² 3p³.
Inani eliphelele lama-electron e-valence:
2 (kwabangu-3) + 3 (kwabangu-3p) = 5
Ngakho-ke, i-phosphorus inama-electron angu-5 e-valence.
Isiphetho
Ukuqonda isakhiwo se-athomu kuhilela ulwazi lwezinhlobo ezahlukene zezinhlayiya ze-subatomic ezifana nama-proton, ama-neutron, nama-electron kanye nendlela ezihlelwe ngayo ngaphakathi kwama-athomu. Ngokuzijwayeza imibuzo efana naleyo exoxwe ngayo, singajulisa ukuqonda kwethu ngalezi zici eziyisisekelo. Isakhiwo se-athomu asiyona nje into eyisisekelo kumakhemikhali, kodwa futhi siyisihluthulelo sokuqonda izimo eziyinkimbinkimbi kakhulu kwisayensi nobunjiniyela.
