The students problem in understanding the electron configurations was caused by the ineffective learning media which is used by the teacher didn't fit the student's characteristic. Therefore, it is important to develop media of Lego Chemistry games for electron configurations class. The validation of the media is validated in three aspects. They were validity from the results of the game, practicality from the results of the questionnaire, and the effectiveness from the results of the pre and post tests. This study used a Research and Development (R & D) model of Borg and Gall conducted in seven stages. The study showed that media of Lego Chemistry games was suitable for teaching learning process. It can be seen from the results of the material and media aspects by 0,83 and 0,94 which was valid. The results of the practicality of the questionnaires on the small and main tryouts were 92,50% and 90,66% and were considered practical. The results of the effectiveness of the N Gain on the small and main tryouts were 0.74 and 0.92 (high). Therefore, media of Lego Chemistry games was valid and effective. It is suitable to be used as the learning media in Chemistry class. PENDAHULUANIlmu kimia merupakan salah satu mata pelajaran yang diajarkan di Sekolah Menengah Atas (SMA) dan dianggap cukup sulit bagi kebanyakan siswa (Yumna, 2017). Materi pelajaran kimia terdiri atas materi yang dapat disajikan secara kongkrit dan abstrak. Struktur atom, partikel atom, partikel materi, ikatan kimia, mekanisme reaksi merupakan materi pelajaran yang bersifat abstrak dan sangat teoritis. Materi ini sebagai dasar dari materi-materi lain. Jika materi struktur atom tidak dikuasai, maka siswa akan sulit memahami tentang karakter suatu unsur atau molekulnya serta keteraturannya dalam sistem periodik. Konsep-konsep dalam struktur atom, seperti penentuan konfigurasi elektron, bilangan kuantum dan sistem periodik unsur merupakan konsep yang abstrak, sehingga perlu ditemukan cara mudah untuk memahaminya (Magdalena, 2017). Pemahaman materi yang bersifat abstrak membutuhkan penggunaan media yang sesuai (Sardiman, 2005).Hasil studi literatur yang telah dilakukan di SMA Muhammadiyah 1 Pontianak memperlihatkan 66,67% siswa menganggap kimia itu sulit salah satunya sub materi konfigurasi elektron.Siswa tertarik jika pembelajaran disajikan dengan permainan.
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