Kurnia Nur AfifahBerdasarkan konfigurasi elektron unsur-unsur dalam tabel periodik unsur dapat ditarik hubungan antara konfigurasi elektron dengan letak unsur dalam tabel periodik unsur sebagai berikut.
- Jumlah elektron valensi = nomor golongan
- Jumlah kulit elektron = nomor periode
Pengecualian terjadi pada unsur helium (He), meskipun memiliki elektron valensi sebesar 2 namun unsur helium terletak pada golongan gas mulia (VIIIA) bukan pada golongan alkali tanah (IIA).
Contohnya hubungan konfigurasi elektron dengan letak unsur dalam tabel periodik untuk golongan 1A periode 1 sampai 7.
| Periode | Unsur | Nomor Atom | K | L | M | N | O | P | Q |
| 1 | Hidrogen (H) | 1 | 1 | ||||||
| 2 | Litium (Li) | 3 | 2 | 1 | |||||
| 3 | Natrium (Na) | 11 | 2 | 8 | 1 | ||||
| 4 | Kalium (K) | 19 | 2 | 8 | 8 | 1 | |||
| 5 | Rubidium (Rb) | 37 | 2 | 8 | 18 | 8 | 1 | ||
| 6 | Sesium (Cs) | 55 | 2 | 8 | 18 | 18 | 8 | 1 | |
| 7 | Fransium (Fr) | 87 | 2 | 8 | 18 | 32 | 18 | 8 | 1 |
Contohnya hubungan konfigurasi elektron dengan letak unsur dalam tabel periodik untuk golongan utama dalam periode 2.
| Golongan | Unsur | Nomor Atom | K | L |
| IA | Litium (Li) | 3 | 2 | 1 |
| IIA | Berilium (Be) | 4 | 2 | 2 |
| IIIA | Boron (B) | 5 | 2 | 3 |
| IVA | Karbon (C) | 6 | 2 | 4 |
| VA | Nitrogen (N) | 7 | 2 | 5 |
| VIA | Oksigen (O) | 8 | 2 | 6 |
| VIIA | Fluor (F) | 9 | 2 | 7 |
| VIIIA | Neon (Ne) | 10 | 2 | 8 |
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Hi,
How are you doing? I am reaching to offer a simple 3 step process of guest post on your website.
1. I will send you some interesting topic ideas for a guest post
2. You will choose one topic out of those topic ideas
3. I will then send you a high- quality article on the topic chosen by you
I would just expect you to give me a do-follow backlink within the main article. So, shall we start with step 1?
Best,
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