1) 1A is called ? a) Main group b) Transition elements c) Noble Gas d) Alkali metal 2) Halogens is ? a) 7A b) 2A c) 5B d) 8A 3) Is energy released when a neutral atom gains an electron? a) Ionisation Energy b) Electron Affinity c) Metallic Character d) Ionic Radius 4) Atomic Radii : from left to right ? a) Decrease b) Increase 5) Ionic Radii : from up to down ? a) Decrease b) Increase

Chemistry

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?